overarch vs reign

overarch is not a noun while reign is a noun.

Word	Noun	Adjective	Verb	Adverb
overarch	No	No	Yes	No
reign	Yes	No	Yes	No

As verbs, reign is a hypernym of overarch; that is, reign is a word with a broader meaning than overarch:

Other hypernyms of overarch include dominate, predominate, prevail, rule.

overarch (noun)	reign (noun)
	royal authority; the dominion of a monarch
	the period during which a monarch is sovereign
	a period during which something or somebody is dominant or powerful

overarch (verb)	reign (verb)
form an arch over	have sovereign power
be central or dominant	be larger in number, quantity, power, status or importance