retroflex vs cacuminal

retroflex and cacuminal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
retroflex	No	Yes	Yes	No
cacuminal	No	Yes	No	No

As adjectives, retroflex and cacuminal are synonyms defined as:

retroflex and cacuminal: pronounced with the tip of the tongue turned back toward the hard palate

retroflex (adjective)	cacuminal (adjective)
bent or curved backward	pronounced with the tip of the tongue turned back toward the hard palate
pronounced with the tip of the tongue turned back toward the hard palate

retroflex (verb)	cacuminal (verb)
articulate (a consonant) with the tongue curled back against the palate
bend or turn backward