おばあさま

お

ば

あ

さ

ま

Meanings

Honorific term for one's own or someone else's grandmother. More respectful than おばあさん.

おばあさん
Less formal than おばあ様; can be used for one's own grandmother or an elderly woman, but おばあ様 is more respectful and honorific.
祖そ母ぼ
Neutral term for 'grandmother' used when referring to one's own grandmother in formal or written contexts. おばあ様 is honorific and warmer.

おばあ様さま
Most common spelling; uses the honorific 様 for a respectful tone.
お祖母ばあ様さま
Kanji spelling for 'grandmother'; this is the usual kanji form for sense 1.
お婆ばあ様さま
Kanji spelling for 'old woman'; this is the usual kanji form for sense 2.

Derived from おばあ (grandmother/old woman) with the honorific suffix 様 (さま), adding a high level of respect.