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

Enter an agreement.

Enter negotiations.

A: the same meaning

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

We like to walk every Sunday.

We must walk with our dispossessed brothers and sisters.

A: different meanings

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

She gave great head.

They tracked him back toward the head of the stream.

A:
different meanings