tail coat vs tails

tail coat and tails both are nouns.

Word	Noun	Adjective	Verb	Adverb
tail coat	Yes	No	No	No
tails	Yes	No	No	No

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

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

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

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