tailcoat vs tails

tailcoat and tails both are nouns.

Word	Noun	Adjective	Verb	Adverb
tailcoat	Yes	No	No	No
tails	Yes	No	No	No

As nouns, tailcoat and tails are synonyms defined as:

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

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