crux

1. A puzzling or apparently insoluble problem.

2. The basic, central, or critical point or feature: the crux of the matter; the crux of an argument.

3. A puzzling or difficult problem an unsolved question.

4. An essential point requiring resolution or resolving an outcome.

5. A main or central feature (as of an argument).

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Top Words by points	Points	Word Game
crux	13	Scrabble

2 Letters	Scrabble® Points
xu	9

3 Letters	Scrabble® Points
cru	5
cur	5

4 Letters	Scrabble® Points
crux	13