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walking stick

Wap (wireless application protocol) phones

watercolour, watercourse, watermark, waterproof, waterworks
one word

web, website

wellbeing

west, western, the west, western Europe

western
(cowboy film)

wheelchair
Say (if relevant) that someone uses a wheelchair, not that they are 'in a wheelchair' or 'wheelchair-bound' — stigmatising and offensive, as well as inaccurate

whence
means 'where from', so don't write 'from whence', avoid if possible

whereabouts
singular: her whereabouts is not known

while
not whilst

white
lc in racial context

wide awake

Wi-Fi
TM; the generic term is wireless computer network

Wimpey
houses

Wimpy
burgers

Windermere
not LakeWindermere; note that Windermere is also the name of the town

winter

wipeout
noun

wipe out
verb

withhold

wits' end

wiz
as in 'she's a total wiz at maths', not whiz or whizz

woeful

woman, women
are nouns, not adjectives, so say female president, female MPs etc rather than 'woman president', 'women MPs'

womenswear

Worcestershire sauce
not Worcester

worldwide
but world wide web

wrack
seaweed; racked with guilt, not wracked; rack and ruin