coin collection vs coin collecting

coin collection and coin collecting both are nouns.

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

As nouns, coin collection and coin collecting are synonyms defined as:

coin collection and coin collecting: the collection and study of money (and coins in particular)

Other synonyms of coin collection include numismatics, numismatology.

coin collection (noun)	coin collecting (noun)
the collection and study of money (and coins in particular)	the collection and study of money (and coins in particular)
a collection of coins