Did you by any chance mean one of these? gabber, gabbro
Examples
“The fishermen and their boats were far down on Cowal after signs of herring; the bay was given up to barque and gabbart alone.”
“In one of the vessels behind him, as he mused, a seaman noiselessly thrust his head out at a companion to look the hour upon the town's clock, and the boy, pale, fair-haired, pondering, with eyes upon the shrouds of a gabbart, forced himself by his stillness and inaction upon the man's notice.”
“But fair fa 'the weaver that wrought the weft o't --- I swung and bobbit yonder as safe as a gabbart that's moored by a three-ply cable at the Broomielaw.' ”
“Stairs, that the wench might embark on the Tay from Perth; and I know for certainty, for I made inquiry, that she sailed in a gabbart for Dundee.”
“Lady’s Stairs, that the wench might embark on the Tay from Perth; and I know for certainty, for I made inquiry, that she sailed in a gabbart for Dundee.”
“But fair fa 'the weaver that wrought the weft o't -- I swung and bobbit yonder as safe as a gabbart* that's moored by a three-ply cable at the Broomielaw. ”
Lists
These user-created lists contain the word ‘gabbart’.
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phrontistery - g
from phrontistery.info
gabardine, gabbart, gabble, gabbro, gabelle, gabion, gablock, gad, gadarene, gadoid, gadroon, gadzookery and 439 more...
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Dr. Jamieson's Birds
A rich list of Scottish bird (nick)names and related terms cited in Dr. Jamieson's Scottish Dictionary and Supplement, 1841.
stone-chatter, clocharet, bowger, coulter-neb, branchers, brissel-cock, turkey-cock, brongie, bubblyjock, polliecock, bullfit, bullfrench and 220 more...
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Quenelles of Random Palavery
More randomly-garnered terms from the world of words that don't quite yet fit into my other lists.
Goddidit, barcelona, filigrain, good-natured, ill-natured, half-bit, endosome, underplaying, parotid, denormalization, sleightgeist, wheezing and 2334 more...
Tweets
Looking for tweets for gabbart.

hernesheir "The mouthful of food which a bird is carrying to its young." --Dr. Jamieson's Scottish Dictionary and Supplement, 1841. May 18, 2011
hernesheir "XXIV. And be it further enacted by the authority of the aforefaid, That no mafter, or no sailor on board any fhip, gabbart, or boat, lying in the faid river between the faid bridge called the Bloody-bridge and the faid river called Dodeer, alias Donnybrook, fhall make or keep any fire on fuch fhip or gabbart for boiling their pots or kettles, or for any other ufe, except candle-light, unlefs fuch fhip or gabbart lye at leaft twenty yards diftance from the keys, where houfes are built,or fhall hereafter be built:" Statutes Passed in the Parliaments Held in Ireland, Vol. III, p. 237. Dublin, Printed by George Grierson, Printer to the King's Moft Excellent Majefty. 1794.
Cf. Scots. gabert, a vessel for inland navigation.
Mar 10, 2011