tail coat vs white tie and tails

tail coat and white tie and tails both are nouns.

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

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

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

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

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