How many letters does the top answer for “to make a will. fuller.” have?

The most common answer is testamentize (12 letters).

Crossword clue: to make a will. fuller.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

testamentize 12 letters web-def

To make a will. [Obs.] Fuller.

a person who makes a will 50% similar → testate, testator

to make a testament, or will. 50% similar → test

to make mad. fuller. 50% similar → bemad