Regional differences in pronunciation affect mainly just three areas:
- short a and ar, 2. short u and short oo 3. long oo
- pant - plant (plarnt in S). Also:
Advanced, after, ah, ask, banana, bath, blast, branch, brass, calf, calm, castle, chance, chant, class, craft, daft, dance, disaster, draft, fast, fasten, father, flabbergast, flask, gasp, ghastly, giraffe, glance, glass, graft, graph, grasp, grass, half, last, mask, mast, palm, panorama, pass, past, path, plant, pyjamas, raft, rascal, rather, salami, shaft, shah, staff, task, trance, vase, vast.
- dull, gull - full, pull
(These have the same sound for some midlanders and people further N)
For most speakers of English (right across the world) only these have a short /oo/ sound:
Good, hood, stood, wood. Book, brook, cook, hook, look, rook, shook, took. Wool. Whoosh. Foot.
Could, should, would.
Bull, full, pull, bullet, bullion. Bush, cushion, push, shush. Cuckoo.
Put, butcher, pudding, pussy, sugar.
Wolf, woman.
Courier.
- The length of long /oo/ , as in 'pool, school, rule' varies a little between accents, an in some parts of US ue/ew and oo, in dew and do, sound the same.