intruder vs interloper

intruder and interloper both are nouns.

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

As nouns, intruder and interloper are synonyms defined as:

intruder and interloper: someone who intrudes on the privacy or property of another without permission

Other synonyms of intruder include trespasser.

intruder (noun)	interloper (noun)
someone who intrudes on the privacy or property of another without permission	someone who intrudes on the privacy or property of another without permission