We found one dictionary that defines the word testatorship:

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1. testatorship: Wiktionary

Definitions from Wiktionary (testatorship) ▸ noun:  The role or status of a testator. ▸ Words similar to testatorship ▸ Usage examples for testatorship ▸ Idioms related to testatorship ▸ Wikipedia articles (New!) ▸ Popular adjectives describing testatorship ▸ Words that often appear near testatorship ▸ Rhymes of testatorship ▸ Invented words related to testatorship