different between sailfin vs tailfin

English

sail +? fin

sailfin (plural sailfins)

A saillike dorsal fin.
Any organism having such a fin, such as a mollie (Poecilia latipinna) or a lizard of the genus Hydrosaurus.

From tail +? fin

tailfin (plural tailfins)

A fin at the tail of a fish, caudal fin
A fin on the tail of an aircraft, vertical stabilizer
(automotive) A fin-like projection at the rear of a car, common on American cars of the 1950s.

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