qual- , quan-, quo
quantity
quantify
quantitative
quality
qualitative
qualify
qualifier
qualified
qualification
qualifying
quandry
quantum
quota
qu, wh -> generally means question
query
quest
question
unquestioned
questionable
unquestionably
questioner
questioning
questionnaire
request
cue
acquire
acquired
acquisition
conquer
conquering
conqueror
conquest
inquire
inquiry
inquisitive
require
required
requirement
requisite
prerequisite
perk
perquisite