"clever person," 1914, probably a special use of whiz "something remarkable" (1908), an extended sense of whizz; or perhaps a shortened and altered form of wizard. Noun phrase whiz kid is from 1930s, a take-off on a radio show's quiz kid.
he heard the whiz of bullets near his head
whitish
whitlow
Whitsun
Whitsunday
whittle
whiz
whizbang
whizz
who
whoa
whodunit
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