salon vs beauty parlor

salon and beauty parlor both are nouns.

Word	Noun	Adjective	Verb	Adverb
salon	Yes	No	No	No
beauty parlor	Yes	No	No	No

As nouns, salon and beauty parlor are synonyms defined as:

Other synonyms of salon include beauty parlour, beauty salon, beauty shop.

salon (noun)	beauty parlor (noun)
elegant sitting room where guests are received	a shop where hairdressers and beauticians work
gallery where works of art can be displayed
a shop where hairdressers and beauticians work