problem (n.)

• ado
• aggravation
• annoyance
• anxiety
• baffle
• bafflement
• basis
• bedevilment
• bewilderment
• blemish
• bore
• bother
• botheration
• bug
• bugaboo
• bugbear
• burden
• case
• catch
• catechism
• chapter
• complication
• concern
• confusion
• conundrum
• count
• crack
• cross-question
• crux
• defect
• defection
• deficiency
• delinquent
• demand
• devilment
• difficulty
• dilemma
• disadvantage
• discomposure
• disconcertion
• disconcertment
• disturbance
• downer
• drag
• drawback
• embarrassment
• enigma
• essence
• evil
• exasperation
• facer
• failing
• failure
• fault
• feeler
• fix
• flaw
• foible
• frailty
• gist
• harassment
• head
• headache
• heading
• hole
• illustration
• imbroglio
• imperfection
• inadequacy
• inconvenience
• infirmity
• inquiry
• interrogation
• interrogative
• interrogatory
• issue
• jam
• kink
• knot
• leader
• matter
• meat
• mess
• molestation
• motif
• motive
• muddle
• mystery
• nuisance
• nut
• perplexity
• persecution
• perturbation
• pest
• pickle
• plight
• point
• poser
• pother
• predicament
• puzzle
• puzzlement
• puzzler
• quandary
• query
• question
• quodlibet
• refractory
• riddle
• rift
• rubric
• scrape
• shortcoming
• snag
• stew
• sticker
• stumper
• subject
• substance
• taint
• text
• theme
• topic
• trial
• trouble
• upset
• vexation
• weakness
• why
• worriment
• worry