Hard-core and True-blue

Hard-core adjective - Firmly established over time.

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

True-blue adjective - Firm in one's allegiance to someone or something.

Hard-core and true-blue are semantically related in honest and faithful topic. Sometimes you can use "Hard-core" instead an adjective phrase "True-blue".