puck vs hockey puck

puck and hockey puck both are nouns.

Word	Noun	Adjective	Verb	Adverb
puck	Yes	No	No	No
hockey puck	Yes	No	No	No

As nouns, puck and hockey puck are synonyms defined as:

puck and hockey puck: a vulcanized rubber disk 3 inches in diameter that is used instead of a ball in ice hockey

puck (noun)	hockey puck (noun)
a vulcanized rubber disk 3 inches in diameter that is used instead of a ball in ice hockey	a vulcanized rubber disk 3 inches in diameter that is used instead of a ball in ice hockey