As nouns the difference between cucumber and horse
is that cucumber is a vine in the gourd family, cucumis sativus while horse is a poker variant consisting of five different poker variants, with the rules changing from one variant to the next after every hand or horse can be (variant of basketball).
As nouns the difference between cucumber and keyboard
is that cucumber is a vine in the gourd family, cucumis sativus while keyboard is keyboard (electronic musical instrument with keys of a musical keyboard).