begum vs lady

begum and lady both are nouns.

Word	Noun	Adjective	Verb	Adverb
begum	Yes	No	No	No
lady	Yes	No	No	No

As nouns, lady is a hypernym of begum; that is, lady is a word with a broader meaning than begum:

Other hypernyms of begum include Moslem, Muslim.

begum (noun)	lady (noun)
a Muslim woman of high rank in India or Pakistan	a woman of refinement
	a polite name for any woman