gran vs grandma

gran and grandma both are nouns.

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

As nouns, gran and grandma are synonyms defined as:

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

gran (noun)	grandma (noun)
the mother of your father or mother	the mother of your father or mother