living room set vs livingroom set

living room set and livingroom set both are nouns.

Word	Noun	Adjective	Verb	Adverb
living room set	Yes	No	No	No
livingroom set	Yes	No	No	No

As nouns, living room set and livingroom set are synonyms defined as:

living room set and livingroom set: a suite of furniture for the living room

Other synonyms of living room set include living-room set, living-room suite, living room suite, livingroom suite.

living room set (noun)	livingroom set (noun)
a suite of furniture for the living room	a suite of furniture for the living room