Die-hard and Die hard

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

Die hard and die-hard are semantically related In some cases you can use "Die hard" instead the phrase "Die-hard" as a noun or an adjective.

Die hard verb - Continue to exist.

Die-hard and die hard are semantically related in stubborn topic. Sometimes you can use "Die-hard" instead the phrase "Die hard" as a noun or an adjective, if it concerns topics such as reactionary, deep-rooted, conservative, dedicated.