tail coat vs dress suit

tail coat and dress suit both are nouns.

Word	Noun	Adjective	Verb	Adverb
tail coat	Yes	No	No	No
dress suit	Yes	No	No	No

As nouns, tail coat and dress suit are synonyms defined as:

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

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

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