How many letters does the top answer for “shaped like a boat” have?

The most common answer is navicular (9 letters).

Crossword clue: shaped like a boat

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

navicular 9 letters wn-def

the largest wrist bone on the thumb side

scaphoid 8 letters wn-def

shaped like a boat

like a wedge; wedge-shaped. 50% similar → wedgy

shaped like a catkin. 50% similar → amentiform

shaped like a cross 50% similar → cruciate, cruciform

shaped like a cube 50% similar → cubical, cubiform, cuboid

shaped like a foot. 50% similar → pediform

shaped like a globe. 50% similar → globeshaped

shaped like a horseshoe. 50% similar → hippocrepiform

shaped like a needle. 50% similar → aciform