imaosa = grandmother (noun) (some things Google found for "imaosa": a rare term; user names; a Star Wars related character first name; somewhat similarly named Emarosa is a six-member post-hardcore band from Kentucky)
Word derivation for "grandmother" :
Basque = amona, Finnish = isoäiti
Miresua = imaosa
This change is because I changed the word for big. My previous word for grandmother was imaoni. This word is a compound of mother (ima) + big (osa).