lottery winner vs winner

lottery winner and winner both are nouns.

Word	Noun	Adjective	Verb	Adverb
lottery winner	Yes	No	No	No
winner	Yes	No	No	No

As nouns, winner is a hypernym of lottery winner; that is, winner is a word with a broader meaning than lottery winner:

lottery winner (noun)	winner (noun)
the winner of a lottery	the contestant who wins the contest
	a gambler who wins a bet
	a person with a record of successes