gatecrasher vs interloper

gatecrasher and interloper both are nouns.

Word	Noun	Adjective	Verb	Adverb
gatecrasher	Yes	No	No	No
interloper	Yes	No	No	No

As nouns, interloper is a hypernym of gatecrasher; that is, interloper is a word with a broader meaning than gatecrasher:

gatecrasher: someone who gets in (to a party) without an invitation or without paying
interloper: someone who intrudes on the privacy or property of another without permission

Other hypernyms of gatecrasher include intruder, trespasser.

gatecrasher (noun)	interloper (noun)
someone who gets in (to a party) without an invitation or without paying	someone who intrudes on the privacy or property of another without permission