nan vs granny

nan and granny both are nouns.

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

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

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

As nouns, nan and granny are synonyms defined as:

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

nan (noun)	granny (noun)
leavened bread baked in a clay oven in India; usually shaped like a teardrop	a reef knot crossed the wrong way and therefore insecure
your grandmother	the mother of your father or mother
the mother of your father or mother	an old woman