quackery – Charlatanry
quadrate – To divide into quarters.
quadruple – To multiply by four.
qualification – A requisite for an employment, position, right, or privilege.
qualify – To endow or furnish with requisite ability, character, knowledge, skill, or possessions.
qualm – A fit of nausea.
quandary – A puzzling predicament.
quantity – Magnitude.
quarantine – The enforced isolation of any person or place infected with contagious disease.
quarrelsome – Irascible.
quarter – One of four equal parts into which anything is or may be divided.
quarterly – Occurring or made at intervals of three months.
quartet – A composition for four voices or four instruments.
quarto – An eight-page newspaper of any size.
quay – A wharf or artificial landing-place on the shore of a harbor or projecting into it.
querulous – Habitually complaining.
query – To make inquiry.
queue – A file of persons waiting in order of their arrival, as for admittance.
quibble – An utterly trivial distinction or objection.
quiescence – Quiet.
quiescent – Being in a state of repose or inaction.
quiet – Making no noise.
quietus – A silencing, suppressing, or ending.
quintessence – The most essential part of anything.
quintet – Musical composition arranged for five voices or instruments.
quite – Fully.
Quixotic – Chivalrous or romantic to a ridiculous or extravagant degree.