different between cylindrical vs fishmouth

English

cylindric +? -al

cylindrical (comparative more cylindrical, superlative most cylindrical)

Shaped like a cylinder.
(cartography) Describing a map projection in which meridians are mapped onto vertical lines and parallels of latitude onto horizontal lines.

fish +? mouth

fishmouth (plural fishmouths)

(roofing) a half-cylindrical or half-conical shaped opening or void in a lapped edge or seam, usually caused by wrinkling or shifting of ply sheets during installation.
(colloquial) A chronically open mouth.

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