dress suit vs full dress

dress suit and full dress both are nouns.

Word	Noun	Adjective	Verb	Adverb
dress suit	Yes	No	No	No
full dress	Yes	No	No	No

As nouns, dress suit and full dress are synonyms defined as:

dress suit and full dress: formalwear consisting of full evening dress for men

Other synonyms of dress suit include tail coat, tailcoat, tails, white tie, white tie and tails.

dress suit (noun)	full dress (noun)
formalwear consisting of full evening dress for men	formalwear consisting of full evening dress for men