boarder vs interloper

boarder and interloper both are nouns.

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

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

boarder: someone who forces their way aboard ship
interloper: someone who intrudes on the privacy or property of another without permission

Other hypernyms of boarder include intruder, trespasser.

boarder (noun)	interloper (noun)
a tenant in someone's house	someone who intrudes on the privacy or property of another without permission
a pupil who lives at school during term time
someone who forces their way aboard ship