polar vs icy

polar and icy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
polar	No	Yes	No	No
icy	No	Yes	No	No

As adjectives, polar and icy are synonyms defined as:

Other synonyms of polar include arctic, frigid, gelid, glacial.

polar (adjective)	icy (adjective)
of or existing at or near a geographical pole or within the Arctic or Antarctic Circles	extremely cold
located at or near or coming from the earth's poles	devoid of warmth and cordiality; expressive of unfriendliness or disdain
having a pair of equal and opposite charges	covered with or containing or consisting of ice
extremely cold	shiny and slick as with a thin coating of ice
being of crucial importance
characterized by opposite extremes; completely opposed