sale vs auction sale

sale and auction sale both are nouns.

Word	Noun	Adjective	Verb	Adverb
sale	Yes	No	No	No
auction sale	Yes	No	No	No

As nouns, auction sale is a hyponym of sale; that is, auction sale is a word with a more specific, narrower meaning than sale:

Other hyponyms of sale include auction, vendue, sell.

sale (noun)	auction sale (noun)
a particular instance of selling	the public sale of something to the highest bidder
an occasion (usually brief) for buying at specially reduced prices
the general activity of selling
an agreement (or contract) in which property is transferred from the seller (vendor) to the buyer (vendee) for a fixed price in money (paid or agreed to be paid by the buyer)
the state of being purchasable; offered or exhibited for selling