“Dilemma: Confused with ‘problem’. If you have a problem, you do not know what to do. There may be many solutions. If you have a dilemma, you have a choice of two courses of action, neither attractive.”
I’m going to keep this summary short to make sure I don’t use any words wrong in it.
The Guardian has compiled a list of 35 words you’re probably using wrong in which it points out the differences between words like compose and comprise, less and fewer, and continual and continuous.