easy
The sun warmed the playground in the morning.
What does Sun mean?
the star at the center of our solar system.
Dictionary definition
The Sun is the star at the center of our solar system; it supplies the light and heat that make life on Earth possible.
Example sentences
Sun in a sentence
medium
Plants need light from the sun to grow.
hard
In science, students learn that Earth moves around the sun during the year.
Writing practice
Ready to write your own? Study the examples, then practice sun in a sentence with Sentence Builder checklist feedback.
Quick practice
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Practice the meaning of Sun
Answer three quick questions about its meaning and related words.
Question 1 of 3
Practice 1
What is the Sun?
The Sun is our solar system's star and produces light and heat.
Practice 2
Which sentence uses Sun correctly as its proper name?
Earth is one of the planets that orbit the Sun.
Practice 3
Choose the best word: The adjective _____ means related to the Sun.
Solar describes things related to the Sun, such as solar energy and the solar system.
Practice complete
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Pronunciation coach
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Sun
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WordSun.
Partnoun.
MeaningSun means the star at the center of our solar system.
ExampleExample: The sun warmed the playground in the morning.
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Synonyms
Words like Sun
our starA plain-language equivalent that identifies the Sun as the star nearest Earth.
SolA name sometimes used for our Sun, especially when distinguishing it from other stars.
Antonym review
Does Sun have an opposite?
Sun names a particular star and has no direct antonym. Moon, night, and darkness are related contrasts, but none is the opposite of the Sun.
Synonym practice
Want to practice sun synonyms in context? Try a Synonym Search question like "The sun warmed the playground after lunch," then compare close word choices. Practice sun synonyms.
Word family
Sun word family
Related words
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Student support
Understand Sun
Hint for students
The Sun is our nearest star and the center of our solar system.
Common mix-up
The Sun is not a planet and the Moon is not another Sun. The Sun produces light; the Moon reflects sunlight.
Try it in class or at home
Use three labeled cards—Sun, Earth, and Moon. Students arrange them to model the system, draw arrows for the two orbits, then annotate which object is a star, planet, or natural satellite and where visible light originates.
Teacher prompt
How are the Sun, Earth, and Moon connected? Use star, planet, natural satellite, light, and orbit in your explanation.
Word Wheel · Grades 1–3
Practice with the Grades 1–3 Space Words Wheel
Spin this foundational Space Words wheel to review familiar objects, exploration tools, meanings, and sentence connections.
Learning activities
Practice Sun and explore more word games
Cards labelled “Practice SUN” keep this word in focus. Explore cards open games with other words.
Practice SUN
Sentence Builder
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Spell Hive
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Vocabulary Match
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Explore · Context
Context Clue Challenge
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Explore · Scramble
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