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"grandma" is also used as a crossword clue. If that's what you saw, the answer is often nana (4 letters).
Definitions
the mother of your father or mother
Word origin
From grand- + ma, after grandmother.
Used in a sentence
““But Grandma—,” I said. […] “And don’t you go ‘Grandma-ing’ me neither,” she said.”
““Gran-” Nancy started. / “Quit Grandma-ing me girl.[…]” Grandma Wilson insisted.”
““He can be my doctor anytime.” / “Grandma, eww!” / “Oh, stop grandma-ing me. You know I hate that. Come introduce us.””
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Mom's mom”7 letters
02“Parent's mother”7 letters
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