imprimatur vs commendation

imprimatur and commendation both are nouns.

Word	Noun	Adjective	Verb	Adverb
imprimatur	Yes	No	No	No
commendation	Yes	No	No	No

As nouns, commendation is a hypernym of imprimatur; that is, commendation is a word with a broader meaning than imprimatur:

Other hypernyms of imprimatur include approval.

imprimatur (noun)	commendation (noun)
formal and explicit approval	an official award (as for bravery or service) usually given as formal public statement
	a message expressing a favorable opinion