Answer:

crux

Answer	Crossword Clue
CRUX	Pivotal point
CRUX	Gist
CRUX	Heart

CRUX	Heart of the matter
CRUX	Nitty-gritty
CRUX	Essence
CRUX	Critical point
CRUX	Pivotal part
CRUX	Nub
CRUX	Decisive stage
CRUX	Central feature

CRUX	Main point
CRUX	Most important point
CRUX	Essential point
CRUX	Centerpoint
CRUX	Center
CRUX	Vital point
CRUX	Key point
CRUX	Core

CRUX	Meat
CRUX	Anything very puzzling.
CRUX	The Southern Cross.
CRUX	Crucial point.
CRUX	Decisive point.
CRUX	Most important point.
CRUX	Puzzling thing.
CRUX	Critical point.

CRUX	Essential point.
CRUX	Main point.
CRUX	Vital point.
CRUX	Critical moment.
CRUX	Pivotal point.
CRUX	Decisive point
CRUX	Main feature
CRUX	Basic point

CRUX	Central point
CRUX	Unsolved question
CRUX	Point
CRUX	Central point, as of an argument
CRUX	Key target of resolution