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

Declare dividends.

The President declared war.

A: different meanings

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

Will online dictionaries ever supplant paper dictionaries?

The computer has supplanted the slide rule.

A: the same meaning

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

The cover concealed their guns from enemy aircraft.

They made a cover of a Beatles' song.

A:
different meanings