Hard core and True

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

True and hard core are semantically related. in loyal topic. In some cases you can use "True" instead an adjective phrase "Hard core", when it comes to topics like faithful.

True adjective - Being exactly as appears or as claimed.

Hard core and true are semantically related. Sometimes you can replace phrase "Hard core" with "True", this terms are similar.