O very commonly becomes a, as archet, orchard, tharn, thorn, vant, font, vram, from, carn, corn.
Quite as commonly it takes the au or aw sound, as hawp, hope, aupen, open, cawls, coals, hawle, hole, smawk, smoke.
In such words as cold and four, the sound is ow rather than aw, thus giving us cowld and vower.
Moss in S. Wilts sometimes takes the long e, becoming mēsh, while in N. Wilts it would merely be mawss.
Know becomes either knaw or kneow.
O is often sounded oo, as goold, gold, cwoort, court, mwoor'n or moor'n, more than, poorch, porch.
Oo is sometimes shortened into ŭ, as shut, shoot, sut, soot, tuk, took.
Very commonly the sound given to ō is wo or woä. Thus we get twoad, toad (sometimes twoad), pwoast, post, bwoy, boy, rwoäs, a rose, bwoän, bone, spwoke (but more usually spawk in N. Wilts), spoke.
Oa at the beginning of a word becomes wu, as wuts, oats.