white tie vs full dress

white tie and full dress both are nouns.

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

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

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

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

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