candlepin vs bowling pin

candlepin and bowling pin both are nouns.

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

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

candlepin: a bowling pin that is thin by comparison with a tenpin
bowling pin: a club-shaped wooden object used in bowling; set up in triangular groups of ten as the target

Other hypernyms of candlepin include pin.

candlepin (noun)	bowling pin (noun)
a bowling pin that is thin by comparison with a tenpin	a club-shaped wooden object used in bowling; set up in triangular groups of ten as the target