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 set, dining-room suite.

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