coin collection vs collection

coin collection and collection both are nouns.

Word	Noun	Adjective	Verb	Adverb
coin collection	Yes	No	No	No
collection	Yes	No	No	No

As nouns, collection is a hypernym of coin collection; that is, collection is a word with a broader meaning than coin collection:

coin collection: the collection and study of money (and coins in particular)
collection: the act of gathering something together

Other hypernyms of coin collection include aggregation, assembling, collecting.

As nouns, collection is a hypernym of coin collection; that is, collection is a word with a broader meaning than coin collection:

Other hypernyms of coin collection include accumulation, aggregation, assemblage.

coin collection (noun)	collection (noun)
the collection and study of money (and coins in particular)	the act of gathering something together
a collection of coins	a publication containing a variety of works
	request for a sum of money
	several things grouped together or considered as a whole