eavesdropper vs snoop

eavesdropper and snoop both are nouns.

Word	Noun	Adjective	Verb	Adverb
eavesdropper	Yes	No	No	No
snoop	Yes	No	Yes	No

As nouns, snoop is a hypernym of eavesdropper; that is, snoop is a word with a broader meaning than eavesdropper:

eavesdropper: a secret listener to private conversations
snoop: a spy who makes uninvited inquiries into the private affairs of others

Other hypernyms of eavesdropper include attender, auditor, hearer, listener, snooper.

eavesdropper (noun)	snoop (noun)
a secret listener to private conversations	a spy who makes uninvited inquiries into the private affairs of others

eavesdropper (verb)	snoop (verb)
	watch, observe, or inquire secretly