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Which one to use?Beginnernounnoun

sonvssun

'Son' is a male child; 'sun' is the star at the centre of our solar system.

Side-by-side comparison

son
noun

Noun. A person's male child.

  • Their eldest son just graduated from university.

  • She named her son after his grandfather.

  • My son starts primary school next September.

sun
noun

Noun. The star at the centre of our solar system, which provides light and heat to Earth.

  • The sun rises in the east and sets in the west.

  • Don't look directly at the sun during the eclipse.

  • After three days of rain, the sun finally came out.

Common mistake

Quick visual error: "My sun is five years old" (correct: son). Or "The son was very bright today" when talking about weather (correct: sun).

Trick to remember it

'Son' has an O like 'boy' — a son is a boy. 'Sun' has a U like 'up' — the sun is up in the sky.

Quick rule

Is it a male child? 'Son'. Is it the star in the sky? 'Sun' (with U for 'up').

Did you know?

The Sun is about 4.6 billion years old and has roughly 5 billion years left before it becomes a red giant. When that happens, it will expand enough to engulf Earth's orbit — so no urgent plans needed.

Practise what you learned

Exercise 1 · Pick the right one

The _____ was so strong on the beach that we needed factor 50 sunscreen.

Exercise 2 · Pick the right one

Their _____ is studying medicine at university and graduates next year.

Exercise 3 · Form the word

Son or sun? "The _____ set behind the mountains, painting the sky orange." Write the correct word.

Hint: This is the astronomical object that sets in the evening.

Frequently asked questions

When do I use "son" and when do I use "sun"?

Is it a male child? 'Son'. Is it the star in the sky? 'Sun' (with U for 'up').

What is the most common mistake with "son" and "sun"?

Quick visual error: "My sun is five years old" (correct: son). Or "The son was very bright today" when talking about weather (correct: sun).

How do I remember the difference between "son" and "sun"?

'Son' has an O like 'boy' — a son is a boy. 'Sun' has a U like 'up' — the sun is up in the sky.

BL

Bryan López

Founder of SpeakUP Academy

July 29, 2026

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