stalker vs prowler

stalker and prowler both are nouns.

Word	Noun	Adjective	Verb	Adverb
stalker	Yes	No	No	No
prowler	Yes	No	No	No

As nouns, stalker and prowler are synonyms defined as:

stalker and prowler: someone who prowls or sneaks about; usually with unlawful intentions

Other synonyms of stalker include sneak.

stalker (noun)	prowler (noun)
someone who stalks game	someone who prowls or sneaks about; usually with unlawful intentions
someone who walks with long stiff strides
someone who prowls or sneaks about; usually with unlawful intentions