tenpin vs bowling pin

tenpin and bowling pin both are nouns.

Word	Noun	Adjective	Verb	Adverb
tenpin	Yes	No	No	No
bowling pin	Yes	No	No	No

As nouns, bowling pin is a hypernym of tenpin; that is, bowling pin is a word with a broader meaning than tenpin:

tenpin: one of the bottle-shaped pins used in bowling
bowling pin: a club-shaped wooden object used in bowling; set up in triangular groups of ten as the target

Other hypernyms of tenpin include pin.

tenpin (noun)	bowling pin (noun)
one of the bottle-shaped pins used in bowling	a club-shaped wooden object used in bowling; set up in triangular groups of ten as the target