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

A chain of ideas, one leading to the next.

The chain of command.

A: the same meaning

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

Raise a mutiny.

Raised edges.

A: different meanings

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

Keep my seat, please.

Keep my job for me while I give birth.

A:
the same meaning