How many letters does the top answer for “freshwater duck of the northern hemisphere having a broad flat bill” have?

The most common answer is shoveler (8 letters).

Crossword clue: freshwater duck of the northern hemisphere having a broad flat bill

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

shoveler 8 letters wn-def

freshwater duck of the northern hemisphere having a broad flat bill

shoveller 9 letters wn-def

freshwater duck of the northern hemisphere having a broad flat bill