snow vs corn snow

snow and corn snow both are nouns.

Word	Noun	Adjective	Verb	Adverb
snow	Yes	No	Yes	No
corn snow	Yes	No	No	No

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

snow: a layer of snowflakes (white crystals of frozen water) covering the ground
corn snow: granular snow formed by alternate thawing and freezing

Other hyponyms of snow include crud, dry snow.

snow (noun)	corn snow (noun)
street names for cocaine	granular snow formed by alternate thawing and freezing
precipitation falling from clouds in the form of ice crystals
a layer of snowflakes (white crystals of frozen water) covering the ground

snow (verb)	corn snow (verb)
conceal one's true motives from especially by elaborately feigning good intentions so as to gain an end
fall as snow