unbowed vs vertical

unbowed is not a noun while vertical is a noun.

Word	Noun	Adjective	Verb	Adverb
unbowed	No	Yes	No	No
vertical	Yes	Yes	No	No

unbowed (noun)	vertical (noun)
	a vertical structural member as a post or stake
	something that is oriented vertically

unbowed (adjective)	vertical (adjective)
erect in posture	at right angles to the plane of the horizon or a base line
not forced to bow down to a conqueror	upright in position or posture
	relating to or involving all stages of a business from production to distribution
	of or relating to different levels in a hierarchy (as levels of social class or income group)