How many letters does the top answer for “the office duty of a trierarch.” have?

The most common answer is trierarchy (10 letters).

Crossword clue: the office duty of a trierarch.

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

trierarchy 10 letters web-def

The office duty of a trierarch.

office or duty of a custodian. 50% similar → custodianship

office or duty of an advocate. 50% similar → advocateship

the office or duty of a trustee. 50% similar → trusteeship