great vs groovy

great is a noun but groovy is not a noun.

Word	Noun	Adjective	Verb	Adverb
great	Yes	Yes	No	No
groovy	No	Yes	No	No

As adjectives, great and groovy are synonyms defined as:

Other synonyms of great include bang-up, bully, corking, cracking, dandy, keen, neat, nifty, not bad, old, peachy, slap-up, smashing, swell.

great (noun)	groovy (noun)
a person who has achieved distinction and honor in some field

great (adjective)	groovy (adjective)
excellent	(British informal) very chic
in an advanced stage of pregnancy	excellent
uppercase
remarkable or out of the ordinary in degree or magnitude or effect
of major significance or importance
relatively large in size or number or extent; larger than others of its kind