Meaning: An animal without a backbone.

Part of speech: noun

Example: Jellyfish are a type of invertebrate.

Category: Science › Biology

Synonyms:

• creature
• animal

Meaning: A punctuation mark used to indicate speech or quotations.

Part of speech: noun

Example: You should use inverted commas for direct quotes.

Category: Language › Grammar

Synonyms:

• quotation mark
• speech mark

Meaning: To examine a situation or issue to find out the truth.

Part of speech: verb

Example: The police will investigate the crime.

Category: Law › Criminal Law

Synonyms:

• examine
• probe

Meaning: To give strength or energy to.

Part of speech: verb

Example: A good night's sleep can invigorate you for the day ahead.

Category: Health

Synonyms:

• energize
• revitalize

Antonyms: weaken

Meaning: Making one feel strong, healthy, and full of energy.

Part of speech: adjective

Example: The invigorating hike left us feeling refreshed.

Category: Health

Synonyms:

• refreshing
• stimulating

Meaning: Being a part of something; complicated or intricate.

Part of speech: adjective

Example: The process is more involved than I expected.

Category: Business

Synonyms:

• complicated
• engaged

Meaning: The act of participating in something.

Part of speech: noun

Example: Her involvement in the community project was commendable.

Category: Social

Synonyms:

• participation
• engagement

Meaning: A chemical element used in medicine and photography.

Part of speech: noun

Example: Iodine is often used as a disinfectant.

Category: Science › Chemistry

Synonyms:

• element
• chemical

Meaning: An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

Part of speech: noun

Example: An ion can be positively or negatively charged.

Category: Science › Chemistry

Synonyms:

• charged particle
• atom

Meaning: A written acknowledgment of a debt.

Part of speech: noun

Example: He gave me an IOU for the money he borrowed.

Category: Finance

Synonyms:

• debt acknowledgment
• promissory note

Meaning: A unique string of numbers separated by periods that identifies each computer using the Internet Protocol to communicate over a network.

Part of speech: noun

Example: Every device connected to the internet has an IP address.

Category: Technology › Networking

Synonyms:

• internet address
• network address

Meaning: A measure of a person's intelligence as indicated by an intelligence test.

Part of speech: noun

Example: Her IQ is above average.

Category: Psychology

Synonyms:

• intelligence quotient
• intelligence measure

Meaning: Relating to Iran or its people.

Part of speech: adjective

Example: The Iranian culture is rich and diverse.

Category: Geography

Synonyms: Persian

Meaning: Relating to Iraq or its people.

Part of speech: adjective

Example: Iraqi cuisine is known for its rich flavors.

Category: Geography

Synonyms: Arab

Meaning: Feeling or characterized by great anger.

Part of speech: adjective

Example: The irate customer demanded a refund.

Category: Social

Synonyms:

• angry
• furious

Meaning: Internet Relay Chat, a protocol for real-time internet chat.

Part of speech: noun

Example: Many people use IRC for group discussions.

Category: Technology › Communication

Synonyms:

• chat protocol
• communication tool

Meaning: The colored part of the eye that controls the size of the pupil.

Part of speech: noun

Example: Her iris was a striking shade of green.

Category: Biology

Synonyms:

• eye color
• pupil control

Meaning: Relating to Ireland or its people.

Part of speech: adjective

Example: Irish music is known for its lively rhythms.

Category: Geography

Synonyms: Celtic

Meaning: A man from Ireland.

Part of speech: noun

Example: The Irishman shared stories of his homeland.

Category: Geography

Synonyms: Irish person

Meaning: To annoy or irritate someone.

Part of speech: verb

Example: His constant interruptions began to irk her.

Category: Social

Synonyms:

• annoy
• irritate

Meaning: To resolve or clarify problems or difficulties.

Part of speech: phrase

Example: We need to iron out the details before the meeting.

Category: Business

Synonyms:

• resolve
• settle

Meaning: Not connected with or relevant to something.

Part of speech: adjective

Example: His remarks were deemed irrelevant to the discussion.

Category: Communication

Synonyms:

• unrelated
• inapplicable

Meaning: Unable to be controlled or restrained.

Part of speech: adjective

Example: Her irrepressible laughter filled the room.

Category: Arts

Synonyms:

• uncontrollable
• unstoppable

Antonyms:

• controllable
• restrained

Meaning: Too attractive or appealing to be resisted.

Part of speech: adjective

Example: The dessert was simply irresistible.

Category: Arts

Synonyms:

• unresistable
• enticing

Antonyms:

• resistible
• repulsive

Meaning: Not showing a proper sense of responsibility.

Part of speech: adjective

Example: His irresponsible behavior led to serious consequences.

Category: Politics

Synonyms:

• reckless
• careless

Antonyms:

• responsible
• reliable

Meaning: To supply water to land or crops to help growth.

Part of speech: verb

Example: Farmers irrigate their fields during dry seasons.

Category: Nature › Agriculture

Synonyms:

• water
• supply

Antonyms:

• dry
• dehydrate

Meaning: Having or showing a tendency to be easily annoyed.

Part of speech: adjective

Example: He felt irritable after a long day at work.

Category: Health

Synonyms:

• grumpy
• testy

Antonyms:

• calm
• patient

Meaning: To make someone annoyed or angry.

Part of speech: verb

Example: His constant talking began to irritate her.

Category: Health

Synonyms:

• annoy
• vex

Antonyms:

• please
• satisfy

Meaning: Causing annoyance or discomfort.

Part of speech: adjective

Example: The noise from the construction site was irritating.

Category: Health

Synonyms:

• annoying
• bothersome

Antonyms:

• pleasant
• enjoyable

Meaning: The state of being annoyed or bothered.

Part of speech: noun

Example: Her irritation was evident when she spoke.

Category: Health

Synonyms:

• annoyance
• discomfort

Antonyms:

• calmness
• peace

Meaning: Internal Revenue Service, the U.S. government agency responsible for tax collection.

Part of speech: noun

Example: You must file your taxes with the IRS.

Category: Business › Finance

Synonyms:

• tax agency
• revenue service

Meaning: Used to form verbs indicating a process or change.

Part of speech: suffix

Example: To 'realise' is to become aware of something.

Category: Grammar

Meaning: Used to form adjectives indicating a characteristic or quality.

Part of speech: suffix

Example: The word 'greenish' describes a shade of green.

Category: Grammar

Meaning: A small island.

Part of speech: noun

Example: They visited a quaint isle during their trip.

Category: Geography

Synonyms:

• island
• islet

Meaning: A suffix used to form nouns indicating a doctrine or belief.

Part of speech: suffix

Example: Buddhism is a major world religion.

Category: Philosophy

Meaning: To set apart from others.

Part of speech: verb

Example: They had to isolate the infected patient.

Category: Health

Synonyms:

• separate
• detach

Antonyms:

• connect
• unite

Meaning: Separated from others; remote.

Part of speech: adjective

Example: They lived in an isolated village.

Category: Geography

Synonyms:

• remote
• secluded

Antonyms:

• connected
• nearby

Meaning: The state of being separated from others.

Part of speech: noun

Example: Isolation can lead to feelings of loneliness.

Category: Health

Synonyms:

• separation
• detachment

Antonyms:

• connection
• union

Meaning: Internet Service Provider, a company that provides access to the internet.

Part of speech: noun

Example: I need to contact my ISP for technical support.

Category: Technology

Synonyms:

• internet provider
• service provider

Meaning: An important topic or problem for debate or discussion.

Part of speech: noun

Example: Climate change is a pressing issue.

Category: Politics

Synonyms:

• topic
• matter

Antonyms:

• nonissue
• irrelevance