commandant vs commander

commandant and commander both are nouns.

Word	Noun	Adjective	Verb	Adverb
commandant	Yes	No	No	No
commander	Yes	No	No	No

As nouns, commandant and commander are synonyms defined as:

Other synonyms of commandant include commanding officer.

commandant (noun)	commander (noun)
an officer in command of a military unit	an officer in command of a military unit
	a commissioned naval officer who ranks above a lieutenant commander and below a captain
	an officer in the airforce
	someone in an official position of authority who can command or control others