tea parlor vs teahouse

tea parlor and teahouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
tea parlor	Yes	No	No	No
teahouse	Yes	No	No	No

As nouns, tea parlor and teahouse are synonyms defined as:

tea parlor and teahouse: a restaurant where tea and light meals are available

Other synonyms of tea parlor include tea parlour, tearoom, teashop.

tea parlor (noun)	teahouse (noun)
a restaurant where tea and light meals are available	a restaurant where tea and light meals are available