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Words

Essential words every 5th grader should know and use confidently.

📇 Word Flashcards

Click a card to reveal the definition. Use arrows to browse.

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📚 Word Lists by Subject

Browse words organized by school subject

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Ecosystem
noun
A community of living things and their environment working together.
Photosynthesis
noun
The process by which plants use sunlight to make food from water and carbon dioxide.
Organism
noun
Any living thing, such as a plant, animal, or bacteria.
Hypothesis
noun
An educated guess or prediction that can be tested by an experiment.
Condensation
noun
The process of gas turning into a liquid, like water drops on a cold glass.
Evaporation
noun
The process of liquid turning into gas, like puddles drying up in the sun.
Molecule
noun
The smallest unit of a substance that still has all its properties.
Adaptation
noun
A feature or behavior that helps a living thing survive in its environment.
Gravity
noun
The force that pulls objects toward each other, keeping us on the ground.
Variable
noun
Something that can change in an experiment.
Fraction
noun
A number that represents part of a whole, written as one number over another (e.g., ½).
Decimal
noun
A number with a decimal point showing values less than one (e.g., 0.5).
Perimeter
noun
The total distance around the outside of a shape.
Volume
noun
The amount of space inside a three-dimensional shape.
Quotient
noun
The answer you get when you divide one number by another.
Numerator
noun
The top number in a fraction, showing how many parts you have.
Denominator
noun
The bottom number in a fraction, showing the total number of equal parts.
Coordinate
noun
A pair of numbers (x, y) that shows a point's location on a graph.
Equivalent
adjective
Equal in value, even if they look different (e.g., ½ = 2/4).
Expression
noun
A combination of numbers, variables, and operations (e.g., 3x + 5).
Democracy
noun
A system of government where people vote to choose their leaders.
Constitution
noun
A written document that outlines the basic laws and principles of a country.
Civilization
noun
An advanced society with organized government, culture, and technology.
Immigration
noun
Moving to a new country to live there permanently.
Revolution
noun
A sudden and major change, often the overthrow of a government.
Colony
noun
A territory controlled by a more powerful country far away.
Amendment
noun
A change or addition to the Constitution or a law.
Economy
noun
The system of making, buying, and selling goods and services in a region.
Legislature
noun
The part of government that makes laws (like Congress).
Independence
noun
Freedom from being ruled by another country or person.
Narrative
noun / adj
A story or account of events, or relating to storytelling.
Metaphor
noun
A comparison of two unlike things without using "like" or "as."
Simile
noun
A comparison using "like" or "as" (e.g., fast as a cheetah).
Theme
noun
The main message or lesson of a story.
Inference
noun
A conclusion you reach based on evidence and reasoning, not directly stated.
Conflict
noun
The main problem or struggle in a story.
Dialogue
noun
Conversation between characters in a story, shown with quotation marks.
Protagonist
noun
The main character of a story.
Antagonist
noun
The character or force that works against the protagonist.
Perspective
noun
The point of view from which a story is told (first person, third person, etc.).