interloper vs unwelcome person

interloper and unwelcome person both are nouns.

Word	Noun	Adjective	Verb	Adverb
interloper	Yes	No	No	No
unwelcome person	Yes	No	No	No

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

interloper: someone who intrudes on the privacy or property of another without permission
unwelcome person: a person who for some reason is not wanted or welcome

Other hypernyms of interloper include persona non grata, entrant.

interloper (noun)	unwelcome person (noun)
someone who intrudes on the privacy or property of another without permission	a person who for some reason is not wanted or welcome