ice vs black ice

ice and black ice both are nouns.

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

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

ice: water frozen in the solid state
black ice: a thin coating of ice (as from freezing mist) on a road or sidewalk; nearly invisible but very hazardous

Other hyponyms of ice include frost, hoar, hoarfrost, rime, hailstone, icicle, ground ice, segregated ice, Taber ice.

ice (noun)	black ice (noun)
a rink with a floor of ice for ice hockey or ice skating	a thin coating of ice (as from freezing mist) on a road or sidewalk; nearly invisible but very hazardous
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