Q: Does the word "unit" mean the same thing in "A unit of wheat is a bushel." and "Change per unit volume."?

A: the same meaning

Q: Does the word "play" mean the same thing in "Play the casinos in Trouville." and "Play the races."?

A: the same meaning

Q: Does the word "pad" mean the same thing in "Pad the seat of the chair." and "Pad a bra."?

A: different meanings

Q: Does the word "spot" mean the same thing in "A bald spot." and "The leopard is noted for the spots of color in its fur."?

A:
the same meaning