gelid vs arctic

gelid is not a noun while arctic is a noun.

Word	Noun	Adjective	Verb	Adverb
gelid	No	Yes	No	No
arctic	Yes	Yes	No	No

As adjectives, gelid and arctic are synonyms defined as:

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

gelid (noun)	arctic (noun)
	a waterproof overshoe that protects shoes from water or snow

gelid (adjective)	arctic (adjective)
extremely cold	extremely cold