1) Although ‘plough’ itself needs no explanation it could have unusual spellings.
1552 such instrumenttes as belongithe unto the pleght, Beckwithshaw and it was the specific in some more difficult compounds: c.1535 twelue plowght hedes, xij beames, xij plowght shethes, Stillingfleet
1551 a ploughe foote, shakill, a tugwithe and a plewbyeme, Altofts
1580 Item 2 plowe soles taken of John Cawthroppe, Beverley
1667 plew beames ... plewstillts, moulboards & plewheads ... 1 plewfootboult, Brayton. The plough-beam was the central longitudinal beam or bar to which other parts were attached
the head was a wood frame to which the share was fixed and the foot was an attachment to the beam which regulated the depth of ploughing
the stilts were handles. Less straightforward are plough-sole, possibly an alternative of ‘beam’ and plough-sheath, described by Fitzherbert as a thin piece of wood, set fast in the plough-beam and also into the share-beam, which was ‘the keye ... of all the plough’.