Which word in the following groups is different?
1 - whale, bear, hedgehog, chimpanzee, camel, salmon salmon
2 - football, wrestling, cricket, volleyball, golf, baseball wrestling
3 - celery, pineapple, radish, leek, aubergine, potato pineappple
4 - shirt, boxer shorts, trousers, tie, bra, socks bra
5 - donkey, fox, tiger, boar, badger, lizard lizard
6 - backgammon, chess, poker, canary, dominoes canary
7 - chicken, turkey, goose, duck, budgie budgie
8 - glider, helicopter, airliner, balloon, surfboard, hang glider surfboard
9 - Atlantic, Pacific, North, Artic, Indian North
10 - petticoat, stockings, underpants, knickers, socks, jumper jumper
11 - aftershave, lipstick, rouge, mascara, eye-liner aftershave
12 - duffel bag, rucksack, suitcase, briefcase, wallet wallet
13 - azure, violet, schooner, indigo, purple, orange schooner
14 - triangle, pyramid, circle, square, rectangle, yolk yolk
15 - hall, shed, attic, kitchen, bathroom, lounge shed
16 - ribs, javelin, relay, shot, hurdles, high-jump, pole-vault ribs
17 - trunk, bush, bark, branch, rings bush
18 - matron, nurse, lecturer, doctor, midwife, surgeon lecturer
19 - cheek, chin, eyelid, jaw, forehead, toe toe
20 - spider, caterpillar, beetle, ant, cockroach, mosquito, stork, bee stork