dining room suite vs dining-room set

dining room suite and dining-room set both are nouns.

Word	Noun	Adjective	Verb	Adverb
dining room suite	Yes	No	No	No
dining-room set	Yes	No	No	No

As nouns, dining room suite and dining-room set are synonyms defined as:

dining room suite and dining-room set: a suite of furniture for the dining room

Other synonyms of dining room suite include dining-room suite, dining room set.

dining room suite (noun)	dining-room set (noun)
a suite of furniture for the dining room	a suite of furniture for the dining room