trespasser vs intruder

trespasser and intruder both are nouns.

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

As nouns, trespasser and intruder are synonyms defined as:

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

Other synonyms of trespasser include interloper.

trespasser (noun)	intruder (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