rarefied vs rare

rarefied and rare both are adjectives.

Word	Noun	Adjective	Verb	Adverb
rarefied	No	Yes	No	No
rare	No	Yes	No	No

As adjectives, rarefied and rare are synonyms defined as:

Other synonyms of rarefied include rarified.

rarefied (adjective)	rare (adjective)
of high moral or intellectual value; elevated in nature or style	marked by an uncommon quality; especially superlative or extreme of its kind
having low density	recurring only at long intervals
	(of meat) cooked a short time; still red inside
	not widely distributed
	having low density
	not widely known; especially valued for its uncommonness