different between flattish vs flatfish

English

flat +? -ish

flattish (not comparable)

Somewhat flat, in any comparable sense of the word.
- 2011, David Taylor, The Complete Contented Cat: Your Ultimate Guide to Feline Fulfilment
  The cobby cat is a solidly built animal with short, thick legs, broad shoulders and rump, and a short, rounded head with a flattish face.

flat +? fish

flatfish (countable and uncountable, plural flatfish or flatfishes)

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.

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