granny vs nan

granny and nan both are nouns.

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

As nouns, granny and nan are synonyms defined as:

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

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

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