grammy
n. countable B1 Intermediate US //ˈɡɹæmi// gram·my
n. a sweet name for your grandmother. You use this when you want to sound warm and friendly.
n. an informal term of endearment for a grandmother. Common in North American English; often used as a direct address or a proper name within a family.
I am visiting my grammy this weekend.
Every summer, the kids look forward to eating the homemade cookies their grammy bakes for them.
While some prefer more formal titles, she insisted that all her grandchildren call her grammy to maintain a sense of approachable warmth.
Usage
Often capitalized when used as a proper noun to address a specific person.