ice vs drift ice

ice and drift ice both are nouns.

Word	Noun	Adjective	Verb	Adverb
ice	Yes	No	Yes	No
drift ice	Yes	No	No	No

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

Other hyponyms of ice include icefall, neve, ice pack, pack ice, ice shelf, shelf ice.

ice (noun)	drift ice (noun)
a rink with a floor of ice for ice hockey or ice skating	masses of ice floating in the open sea
an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant
a frozen dessert with fruit flavoring (especially one containing no milk)
a flavored sugar topping used to coat and decorate cakes
the frozen part of a body of water
diamonds
water frozen in the solid state