nan vs gran

nan and gran both are nouns.

Word	Noun	Adjective	Verb	Adverb
nan	Yes	No	No	No
gran	Yes	No	No	No

As nouns, gran is a hypernym of nan; that is, gran is a word with a broader meaning than nan:

Other hypernyms of nan include grandma, grandmother, grannie, granny, nan, nanna.

As nouns, nan and gran are synonyms defined as:

Other synonyms of nan include grandma, grandmother, grannie, granny, nanna.

nan (noun)	gran (noun)
leavened bread baked in a clay oven in India; usually shaped like a teardrop	the mother of your father or mother
your grandmother
the mother of your father or mother