male monarch vs crowned head

male monarch and crowned head both are nouns.

Word	Noun	Adjective	Verb	Adverb
male monarch	Yes	No	No	No
crowned head	Yes	No	No	No

As nouns, crowned head is a hypernym of male monarch; that is, crowned head is a word with a broader meaning than male monarch:

Other hypernyms of male monarch include adult male, man, monarch, sovereign.

male monarch (noun)	crowned head (noun)
a male sovereign; ruler of a kingdom	a nation's ruler or head of state usually by hereditary right