We create new words from old ones.

History is a subject. A historian is a person. His job is to study history.

Music is art. A musician has a job to play music.

Science is a subject. A scientist studies everything around us.

A wife is a woman who has a husband. A house is a place where husband and wife live. A housewife is a woman who doesn't go out to work.

Not everybody can sing. But singers are very good at it.

Cooks can cook very tasty dinners.

Classrooms are rooms for classes.

Homework is work you have to do at home.

!!!! But

Butter and flies have nothing to do with butterflies.

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Eggs don't grow on eggplant.