tea parlour vs teahouse

tea parlour and teahouse both are nouns.

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

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

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

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

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