His specialty is physics.

He is a specialist in that field.

He has expert knowledge.

He couldn't say anything about issues outside of his field of expertise.

He is studying computer science at a specialized school.

He is a specialist fool, with no interest in anything outside his field.

There are many different specialty stores in this town.

A fireworks festival will be held in May.

I go to the gym at five o'clock every day.

This compound word is very important for learning Japanese.