solarium vs sun parlour

solarium and sun parlour both are nouns.

Word	Noun	Adjective	Verb	Adverb
solarium	Yes	No	No	No
sun parlour	Yes	No	No	No

As nouns, solarium and sun parlour are synonyms defined as:

solarium and sun parlour: a room enclosed largely with glass and affording exposure to the sun

Other synonyms of solarium include sun lounge, sun parlor, sun porch, sunporch, sunroom.

solarium (noun)	sun parlour (noun)
a room enclosed largely with glass and affording exposure to the sun	a room enclosed largely with glass and affording exposure to the sun