casbah vs kasbah

casbah and kasbah both are nouns.

Word	Noun	Adjective	Verb	Adverb
casbah	Yes	No	No	No
kasbah	Yes	No	No	No

As nouns, casbah and kasbah are synonyms defined as:

casbah and kasbah: an older or native quarter of many cities in northern Africa; the quarter in which the citadel is located

casbah (noun)	kasbah (noun)
an older or native quarter of many cities in northern Africa; the quarter in which the citadel is located	an older or native quarter of many cities in northern Africa; the quarter in which the citadel is located