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

There is strength in union.

Let C be the union of the sets A and B.

A: different meanings

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

It is not work but worry that kills.

His worry over the prospect of being fired.

A: the same meaning

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

I have to catch a train at 7 o'clock.

I have some free time tonight so I think I'll catch a movie.

A:
different meanings