Quadrant: a 90 degree arc.
Quagmire: swamp; a difficult, awkward or dangerous situation.
Quaintly: attractively old-fashioned; pleasantly strange.
Quandary: dilemma; a state of uncertainty or...
A for aardvark B for behavior C for chromium D for delegate E for electric F for flounder G for gargoyle H for historic I for imperial J for jeopardy K for kangaroo L for landlady M for mandolin N...