The term GRANDMA, SOMETIMES can be broken down into two crossword solutions: SITTER (6 letters) and NANA (4 letters). Grandma is a term of endearment used to refer to one's grandmother. It is often used as a nickname for grandmothers, especially in the United States. SITTER is a term used to refer to someone who looks after children or elderly people in their home. NANA is another term of endearment used to refer to one's grandmother, similar to Grandma. It is commonly used in the United Kingdom and Australia.