philately vs collection

philately and collection both are nouns.

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

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

Other hypernyms of philately include aggregation, assembling, collecting.

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