Crux and Critical mass

Crux noun - The central part or aspect of something under consideration.

Critical mass and crux are semantically related. In some cases you can use "Critical mass" instead a noun "Crux".

Critical mass noun - The minimum amount (of something) required to start or maintain a venture.

Crux and critical mass are semantically related. Sometimes you can use "Crux" instead a noun phrase "Critical mass".