snoop vs eavesdropper

snoop and eavesdropper both are nouns.

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

As nouns, eavesdropper is a hyponym of snoop; that is, eavesdropper is a word with a more specific, narrower meaning than snoop:

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

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

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