Meaning: A flow of mud down a slope, often caused by heavy rain.

Part of speech: noun

Example: The mudslide blocked the road.

Category: Nature

Synonyms:

• landslide
• debris flow

Meaning: Darkness or thick mist that makes it difficult to see.

Part of speech: noun

Example: The murk of the early morning made driving hazardous.

Category: Nature

Synonyms:

• darkness
• gloom

Antonyms:

• brightness
• clarity

Meaning: Not clear; dark or cloudy.

Part of speech: adjective

Example: The water in the pond was murky and uninviting.

Synonyms:

• cloudy
• unclear

Antonyms:

• clear
• bright

Meaning: A wild horse of the western U.S.

Part of speech: noun

Example: The mustang galloped across the plains.

Category: Nature › Animals

Synonyms: wild horse

Meaning: a female goat

Part of speech: noun

Example: The nanny goat gave birth to two kids.

Category: Nature › Animals

Meaning: A type of flowering plant often used in gardens.

Part of speech: noun

Example: The nasturtium added vibrant color to the garden.

Category: Nature › Botany

Synonyms: flower

Meaning: A protected area of land for conservation and recreation.

Part of speech: noun

Example: We visited the national park to see the wildlife.

Category: Nature

Synonyms: nature reserve

Meaning: Existing in or caused by nature; not made or caused by humankind.

Part of speech: adjective

Example: The park is known for its natural beauty.

Category: Nature

Synonyms:

• organic
• innate

Antonyms:

• artificial
• unnatural

Meaning: The physical world collectively, including plants, animals, and landscapes.

Part of speech: noun

Example: Nature is beautiful in the spring.

Synonyms:

• environment
• natural world

Meaning: A path through a natural area for walking and observing nature.

Part of speech: noun

Example: We walked along the nature trail to enjoy the scenery.

Category: Nature

Synonyms: hiking trail

Meaning: A sweet liquid produced by flowers, often collected by bees.

Part of speech: noun

Example: The flowers attract bees with their sweet nectar.

Category: Nature › Botany

Synonyms: honey

Meaning: The sound made by a horse.

Part of speech: verb

Example: The horse began to neigh when it saw its owner.

Category: Nature › Animals

Synonyms: whinny

Meaning: To settle or move into a comfortable position.

Part of speech: verb

Example: The cat likes to nestle in my lap.

Category: Nature › Animal Behavior

Synonyms:

• settle
• snuggle

Antonyms:

• dislodge
• remove

Meaning: A young bird that has not yet fledged.

Part of speech: noun

Example: The nestling chirped for food.

Category: Nature › Birds

Synonyms:

• chick
• young bird

Meaning: A plant with stinging hairs that can cause skin irritation.

Part of speech: noun

Example: Be careful of the nettle when walking in the woods.

Category: Nature › Plants

Synonyms: stinging plant

Meaning: A small amphibian that can live both in water and on land.

Part of speech: noun

Example: We spotted a newt in the garden pond.

Category: Nature › Amphibians

Synonyms: salamander

Meaning: A bird known for its beautiful song, often associated with love and romance.

Part of speech: noun

Example: The nightingale sang sweetly in the garden.

Category: Nature › Birds

Synonyms: songbird

Meaning: To pinch or bite lightly.

Part of speech: verb

Example: The dog likes to nip at my heels.

Category: Nature › Animals

Synonyms:

• bite
• pinch

Meaning: Cold enough to make one feel chilly.

Part of speech: adjective

Example: It's a bit nippy outside; wear a jacket.

Category: Nature › Weather

Synonyms:

• chilly
• cool

Antonyms: warm

Meaning: Active during the night.

Part of speech: adjective

Example: Owls are nocturnal creatures.

Category: Nature › Animals

Synonyms:

• night-active
• nighttime

Antonyms: diurnal

Meaning: A sound, especially one that is loud or unpleasant.

Part of speech: noun

Example: The noise from the construction site was annoying.

Category: Nature › Sound

Synonyms:

• sound
• din

Antonyms: silence

Meaning: Without noise; silent.

Part of speech: adjective

Example: The noiseless operation of the machine impressed everyone.

Category: Nature › Sound

Synonyms:

• silent
• quiet

Antonyms: noisy

Meaning: Having an extremely unpleasant smell.

Part of speech: adjective

Example: The noisome garbage attracted flies.

Category: Nature › Odors

Synonyms:

• foul
• offensive

Meaning: Making a lot of noise; loud.

Part of speech: adjective

Example: The party was very noisy.

Category: Nature › Sound

Synonyms:

• loud
• boisterous

Antonyms: quiet

Meaning: a person who grows and sells plants

Part of speech: noun

Example: The nurseryman helped me choose the right flowers.

Category: Nature › Horticulture

Synonyms:

• gardener
• plant seller

Meaning: a small, hard shell that covers a nut

Part of speech: noun

Example: The nut fell from the tree and landed in its nutshell.

Category: Nature › Botany

Synonyms:

• shell
• husk

Meaning: to gently rub or push against someone or something with your nose

Part of speech: verb

Example: The puppy likes to nuzzle my hand.

Category: Nature › Animals

Synonyms:

• snuggle
• cuddle

Meaning: a type of tree known for its strength

Part of speech: noun

Example: The oak tree in the park is very old.

Category: Nature › Trees

Synonyms:

• tree
• timber

Meaning: a fertile spot in a desert

Part of speech: noun

Example: They found an oasis with water and palm trees.

Category: Nature › Geography

Synonyms:

• haven
• refuge

Antonyms: desert

Meaning: a large body of salt water that covers most of the Earth's surface.

Part of speech: noun

Example: The ocean is home to many species of marine life.

Category: Nature

Synonyms:

• sea
• water

Antonyms:

• land
• ground

Meaning: relating to the ocean.

Part of speech: adjective

Example: Oceanic currents affect global weather patterns.

Category: Nature

Synonyms:

• marine
• aquatic

Meaning: a sea creature with eight arms.

Part of speech: noun

Example: The octopus is known for its intelligence.

Category: Nature › Marine Biology

Synonyms:

• cephalopod
• marine animal

Meaning: The distant part of the sea visible from the shore.

Part of speech: noun

Example: The ship was sailing in the offing.

Category: Nature › Ocean

Synonyms:

• horizon
• distance

Meaning: A thin layer of oil on the surface of water.

Part of speech: noun

Example: The oil slick was visible from the shore.

Category: Nature › Environmental Issues

Synonyms: oil spill

Meaning: A plant grown for its oil-rich seeds, used in cooking and industry.

Part of speech: noun

Example: Oilseed rape is commonly used to produce vegetable oil.

Category: Nature › Agriculture

Synonyms: canola

Meaning: A flowering shrub that is toxic if ingested.

Part of speech: noun

Example: The oleander blooms beautifully in the summer.

Category: Nature › Botany

Synonyms: nerium

Meaning: A sudden, strong movement or flow.

Part of speech: noun

Example: The onrush of water flooded the streets.

Category: Nature

Synonyms:

• surge
• rush

Meaning: A period during which hunting is allowed.

Part of speech: noun

Example: It's open season for deer hunting this month.

Category: Nature › Wildlife

Synonyms: hunting season

Meaning: A nocturnal marsupial native to the Americas.

Part of speech: noun

Example: The opossum is known for playing dead when threatened.

Category: Nature › Wildlife

Synonyms: marsupial

Meaning: A round, sweet citrus fruit with a tough skin.

Part of speech: noun

Example: I had an orange for breakfast.

Category: Nature › Fruits

Synonyms: citrus