- quackeryn.Charlatanry 
 
- quadratev.To divide into quarters
 
- quadruplev.To multiply by four
 
- qualificationn.A requisite for an employment, position, right, or privilege
 
- qualifyv.To endow or furnish with requisite ability, character, knowledge, skill, or possessions
 
- qualmn.A fit of nausea
 
- quandaryn.A puzzling predicament
 
- quantityn.Magnitude
 
- quarantinen.The enforced isolation of any person or place infected with contagious disease
 
- quarrelsomeadj.Irascible
 
- quartern.One of four equal parts into which anything is or may be divided
 
- quarterlyadj.Occurring or made at intervals of three months
 
- quartetn.A composition for four voices or four instruments
 
- quarton.An eight-page newspaper of any size
 
- quayn.A wharf or artificial landing-place on the shore of a harbor or projecting into it
 
- querulousadj.Habitually complaining
 
- queryv.To make inquiry
 
- queuen.A file of persons waiting in order of their arrival, as for admittance
 
- quibblen.An utterly trivial distinction or objection
 
- quiescencen.Quiet
 
- quiescentadj.Being in a state of repose or inaction
 
- quietadj.Making no noise
 
- quietusn.A silencing, suppressing, or ending
 
- quintessencen.The most essential part of anything
 
- quintetn.Musical composition arranged for five voices or instruments
 
- quiteadv.Fully
 
- Quixoticadj.Chivalrous or romantic to a ridiculous or extravagant degree