An inflatable boat.
A toy, made from rubber or rubber-like plastic, shaped like a duck; usually a floating bathtub toy.
To act as a sounding board for a programmer that is debugging their code, facilitating rubber duck debugging.
A single-masted sailboat with only one headsail.
A sailing warship, smaller than a frigate, with its guns all on one deck.
A sloop-of-war, smaller than a frigate, larger than a corvette.