gringo vs foreigner

gringo and foreigner both are nouns.

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

As nouns, foreigner is a hypernym of gringo; that is, foreigner is a word with a broader meaning than gringo:

gringo: a Latin American (disparaging) term for foreigners (especially Americans and Englishmen)
foreigner: a person who comes from a foreign country; someone who does not owe allegiance to your country

Other hypernyms of gringo include alien, noncitizen, outlander.

gringo (noun)	foreigner (noun)
a Latin American (disparaging) term for foreigners (especially Americans and Englishmen)	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