foreigner vs outsider

foreigner and outsider both are nouns.

Word	Noun	Adjective	Verb	Adverb
foreigner	Yes	No	No	No
outsider	Yes	No	No	No

As nouns, foreigner and outsider are synonyms defined as:

foreigner and outsider: someone who is excluded from or is not a member of a group

foreigner (noun)	outsider (noun)
a person who comes from a foreign country; someone who does not owe allegiance to your country	someone who is excluded from or is not a member of a group
someone who is excluded from or is not a member of a group	a contestant (human or animal) not considered to have a good chance to win