As a noun flatfish
is a fish of the order pleuronectiformes, the adults of which have both eyes on one side and usually swim with the other side down, such as a flounder, a halibut, or a sole.
As an adjective flattish is
somewhat flat, in any comparable sense of the word.
flatfish
English
Noun
A fish of the order Pleuronectiformes, the adults of which have both eyes on one side and usually swim with the other side down, such as a flounder, a halibut, or a sole.
Hyponyms
* See also
flattish
English
Adjective
(-)
Somewhat flat, in any comparable sense of the word.