different between prickleback vs stickleback

English

prickle +? back

prickleback (plural pricklebacks)

Wikispecies

From dialectal stickle (“a prickle, spine, sting”), from Old English sticel + bæc. See stick (transitive verb) and compare banstickle.

stickleback (plural sticklebacks)

Any one of numerous species of small fish of the family Gasterosteidae. The back is armed with two or more sharp spines. They inhabit both salt and brackish water, and construct nests from weeds.
Synonyms: sticklebag, sharpling

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