intruder vs trespasser

intruder and trespasser both are nouns.

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

As nouns, intruder and trespasser are synonyms defined as:

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

Other synonyms of intruder include interloper.

intruder (noun)	trespasser (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