kaftan vs frock

kaftan and frock both are nouns.

Word	Noun	Adjective	Verb	Adverb
kaftan	Yes	No	No	No
frock	Yes	No	Yes	No

As nouns, frock is a hypernym of kaftan; that is, frock is a word with a broader meaning than kaftan:

kaftan: a woman's dress style that imitates the caftan cloaks worn by men in the Near East
frock: a one-piece garment for a woman; has skirt and bodice

Other hypernyms of kaftan include dress.

kaftan (noun)	frock (noun)
a (cotton or silk) cloak with full sleeves and sash reaching down to the ankles; worn by men in the Levant	a one-piece garment for a woman; has skirt and bodice
a woman's dress style that imitates the caftan cloaks worn by men in the Near East	a habit worn by clerics
	a long, loose outer garment

kaftan (verb)	frock (verb)
	put a frock on