different between hagdon vs hackbolt

English

Unknown. Compare later haglet (“shearwater, petrel”). Attested (as hagden) from the 17th century.

hagdon (plural hagdons)

(regional, now rare) One of several species of sea birds of the genus Puffinus, especially, Ardenna gravis (syn. Puffinus gravis, Puffinus major), the great shearwater, and Puffinus stricklandi, the black hagdon or sooty shearwater.

hagdon on Wikipedia.Wikipedia
Puffinus on Wikispecies.Wikispecies
“hagden, n.”, in OED Online ?, Oxford, Oxfordshire: Oxford University Press, December 2016
hagdon in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.

hackbolt (plural hackbolts)

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