cost accountant vs comptroller

cost accountant and comptroller both are nouns.

Word	Noun	Adjective	Verb	Adverb
cost accountant	Yes	No	No	No
comptroller	Yes	No	No	No

As nouns, comptroller is a hypernym of cost accountant; that is, comptroller is a word with a broader meaning than cost accountant:

cost accountant: a specialist in the systematic recording and analysis of the costs incident to production
comptroller: someone who maintains and audits business accounts

Other hypernyms of cost accountant include accountant, controller.

cost accountant (noun)	comptroller (noun)
a specialist in the systematic recording and analysis of the costs incident to production	someone who maintains and audits business accounts