criminal vs reprehensible

criminal is a noun but reprehensible is not a noun.

Word	Noun	Adjective	Verb	Adverb
criminal	Yes	Yes	No	No
reprehensible	No	Yes	No	No

As adjectives, criminal and reprehensible are synonyms defined as:

criminal and reprehensible: bringing or deserving severe rebuke or censure

Other synonyms of criminal include condemnable, deplorable, vicious.

criminal (noun)	reprehensible (noun)
someone who has committed a crime or has been legally convicted of a crime

criminal (adjective)	reprehensible (adjective)
guilty of crime or serious offense	bringing or deserving severe rebuke or censure
involving or being or having the nature of a crime
bringing or deserving severe rebuke or censure