sale vs clearance sale

sale and clearance sale both are nouns.

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

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

sale (noun)	clearance sale (noun)
a particular instance of selling	a sale to reduce inventory
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