monarch vs chief of state

monarch and chief of state both are nouns.

Word	Noun	Adjective	Verb	Adverb
monarch	Yes	No	No	No
chief of state	Yes	No	No	No

As nouns, chief of state is a hypernym of monarch; that is, chief of state is a word with a broader meaning than monarch:

monarch: a nation's ruler or head of state usually by hereditary right
chief of state: the chief public representative of a country who may also be the head of government

Other hypernyms of monarch include head of state, ruler, swayer.

monarch (noun)	chief of state (noun)
large migratory American butterfly having deep orange wings with black and white markings; the larvae feed on milkweed	the chief public representative of a country who may also be the head of government
a nation's ruler or head of state usually by hereditary right