Die-hard and Full-fledged

Die-hard adjective - Tending to favor established ideas, conditions, or institutions.

Full-fledged and die-hard are semantically related. In some cases you can use "Full-fledged" instead an adjective phrase "Die-hard".

Full-fledged adjective - Fully grown or developed.

Die-hard and full-fledged are semantically related. Sometimes you can use "Die-hard" instead an adjective phrase "Full-fledged".