Son and sun are two more nouns that sound exactly the same but are spelled differently and have different meanings.
A son is a male child. Try to picture the -o in the middle of the word as the child’s round face.
My mother has two daughters and a son.
Sometimes a father names his son after himself.
The sun is a huge sphere of fiery gas that gives light and heat to our world. Our sun is part of the universe. Both sun and universe have a -u.
The sun is the center of our solar system.
It always feels warmer when the sun is out.
Remember that the -o in son is like the child’s round face. Sun with a -u is part of the universe.