groovy vs slap-up

groovy and slap-up both are adjectives.

Word	Noun	Adjective	Verb	Adverb
groovy	No	Yes	No	No
slap-up	No	Yes	No	No

As adjectives, groovy and slap-up are synonyms defined as:

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

groovy (adjective)	slap-up (adjective)
(British informal) very chic	excellent
excellent