Hard core and Trigger-happy

Hard core noun - The most dedicated and intensely loyal nucleus of a group or movement.

Trigger-happy and hard core are semantically related. In some cases you can use "Trigger-happy" instead an adjective phrase "Hard core".

Trigger-happy adjective - Irresponsible in the use of firearms.

Hard core and trigger-happy are semantically related. Sometimes you can use "Hard core" instead an adjective phrase "Trigger-happy".