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

A crop circle was made in a corn field.

There were some cows grazing in a field.

A: the same meaning

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

He occupied a post in the treasury.

Parcel post.

A: the same meaning

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

200 head of cattle and 50 head of horses.

A head of steam.

A:
different meanings