philatelist vs collector

philatelist and collector both are nouns.

Word	Noun	Adjective	Verb	Adverb
philatelist	Yes	No	No	No
collector	Yes	No	No	No

As nouns, collector is a hypernym of philatelist; that is, collector is a word with a broader meaning than philatelist:

Other hypernyms of philatelist include aggregator.

philatelist (noun)	collector (noun)
a collector and student of postage stamps	the electrode in a transistor through which a primary flow of carriers leaves the region between the electrodes
	a crater that has collected cosmic material hitting the earth
	a person who is employed to collect payments (as for rent or taxes)
	a person who collects things