white tie and tails vs tail coat

white tie and tails and tail coat both are nouns.

Word	Noun	Adjective	Verb	Adverb
white tie and tails	Yes	No	No	No
tail coat	Yes	No	No	No

As nouns, white tie and tails and tail coat are synonyms defined as:

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

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

white tie and tails (noun)	tail coat (noun)
formalwear consisting of full evening dress for men	formalwear consisting of full evening dress for men