Q: Does "unit" have the same meaning in the following two sentences?

The dollar is the United States unit of currency.

The word is a basic linguistic unit.

A: different meanings

Q: Does "pay" have the same meaning in the following two sentences?

Crime doesn't pay.

To pay attention.

A: different meanings

Q: Does "time" have the same meaning in the following two sentences?

Time stops for nobody.

He called four times.

A:
different meanings