white tie vs white tie and tails

white tie and white tie and tails both are nouns.

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

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

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

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

white tie (noun)	white tie and tails (noun)
bow tie worn as part of a man's formal evening dress	formalwear consisting of full evening dress for men
formalwear consisting of full evening dress for men