outsider vs foreigner

outsider and foreigner both are nouns.

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

As nouns, outsider and foreigner are synonyms defined as:

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

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