Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun pontoon

2 senses of pontoon

Sense 1
pontoon -- ((nautical) a floating structure (as a flat-bottomed boat) that serves as a dock or to support a bridge)
       => barge, flatboat, hoy, lighter -- (a flatbottom boat for carrying heavy loads (especially on canals))

Sense 2
pontoon -- (a float supporting a seaplane)
       => float -- (something that floats on the surface of water)