princess vs maharanee

princess and maharanee both are nouns.

Word	Noun	Adjective	Verb	Adverb
princess	Yes	No	No	No
maharanee	Yes	No	No	No

As nouns, maharanee is a hyponym of princess; that is, maharanee is a word with a more specific, narrower meaning than princess:

princess: a female member of a royal family other than the queen (especially the daughter of a sovereign)
maharanee: a great rani; a princess in India or the wife of a maharaja

Other hyponyms of princess include archduchess, crown princess, maharani, princess royal.

princess (noun)	maharanee (noun)
a female member of a royal family other than the queen (especially the daughter of a sovereign)	a great rani; a princess in India or the wife of a maharaja