oo

(1) long /oo/：boo, coo, moo, poo, too, woo, zoo, goo, gooey, shoo, boo-boo, boo-hoo, peek-a-boo, bamboozle, bamboo, taboo, tattoo, voodoo, goo-goo, yoo-hoo, yahoo, cuckoo, igloo, kangaroo, shampoo, ah-choo, choo-choo, mooch, mood, food, brood, oodle, doodle, noodle, poodle, goof, hoof, roof, aloof, spoof, proof, proofread, future-proof, tamper-proof, foolproof, bulletproof, shatterproof, blastproof, fireproof, waterproof, rustproof, weatherproof, sunproof, cool, fool, pool, tool, school, spool, whirlpool, drool, stool, boom, doom, loom, room, zoom, bloom, gloom, heirloom, broom, groom, bedroom, bathroom, classroom, mushroom, boon, coon, loon, moon, noon, soon, baboon, cocoon, tycoon, raccoon, buffoon, typhoon, lagoon, balloon, saloon, afternoon, spoon, harpoon, lampoon, croon, maroon, macaroon, bassoon, monsoon, cartoon, platoon, swoon, coop, hoop, poop, loop, sloop, scoop, snoop, Snoopy, spooky, stoop, swoop, droop, troop, loofah, loose, moose, noose, goose, mongoose, caboose, choose, hoot, loot, moot, root, toot, boot, bootstrap, reboot, shoot, troubleshoot, snoot, scoot, scooter, rooster, uproot, boost, booth, tooth, soothe, smooth, smoothie, groovy, groove, behoove, oops, ooze, booze, snooze, blooper

(2) short /oo/：book, cook, look, outlook, overlook, took, nook, hook, shook, brook, crook, rook, rookie, cookie, good, hood, stood, wood, wool, foot, soot, woof, hoof, hooray

(3) door, floor

(4) blood, flood (short u)