tails vs full dress

tails and full dress both are nouns.

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

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

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

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

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