white tie vs evening clothes

white tie and evening clothes both are nouns.

Word	Noun	Adjective	Verb	Adverb
white tie	Yes	No	No	No
evening clothes	Yes	No	No	No

As nouns, evening clothes is a hypernym of white tie; that is, evening clothes is a word with a broader meaning than white tie:

Other hypernyms of white tie include evening dress, eveningwear, formalwear.

white tie (noun)	evening clothes (noun)
bow tie worn as part of a man's formal evening dress	attire to wear on formal occasions in the evening
formalwear consisting of full evening dress for men