full dress vs white tie

full dress and white tie both are nouns.

Word	Noun	Adjective	Verb	Adverb
full dress	Yes	No	No	No
white tie	Yes	No	No	No

As nouns, full dress and white tie are synonyms defined as:

full dress and white tie: formalwear consisting of full evening dress for men

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

full dress (noun)	white tie (noun)
formalwear consisting of full evening dress for men	bow tie worn as part of a man's formal evening dress
	formalwear consisting of full evening dress for men