stamp collecting vs stamp collection

stamp collecting and stamp collection both are nouns.

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

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

stamp collecting and stamp collection: the collection and study of postage stamps

Other synonyms of stamp collecting include philately.

stamp collecting (noun)	stamp collection (noun)
the collection and study of postage stamps	the collection and study of postage stamps
	a collection of stamps