crowned head vs ruler

crowned head and ruler both are nouns.

Word	Noun	Adjective	Verb	Adverb
crowned head	Yes	No	No	No
ruler	Yes	No	No	No

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

Other hypernyms of crowned head include chief of state, head of state, swayer.

crowned head (noun)	ruler (noun)
a nation's ruler or head of state usually by hereditary right	measuring stick consisting of a strip of wood or metal or plastic with a straight edge that is used for drawing straight lines and measuring lengths
	a person who rules or commands