There are only 846/171,476 (.49%) words that begin with the letter Q in the English dictionary.
Qadi: A judge
Qanat: sloping underground channel or tunnel constructed to lead water from the interior of a hill to a village below
Quirt: a short-handled riding whip with a braided leather lash
Quip: a witty remark
Quash: reject or void, especially by legal procedure
Quinquennially: occurring once every five years or over a period of five years
Qualmishness: overly scrupulous