stance vs uprightness

stance and uprightness both are nouns.

Word	Noun	Adjective	Verb	Adverb
stance	Yes	No	No	No
uprightness	Yes	No	No	No

As nouns, uprightness is a hyponym of stance; that is, uprightness is a word with a more specific, narrower meaning than stance:

Other hyponyms of stance include address, attention, erectness.

stance (noun)	uprightness (noun)
standing posture	righteousness as a consequence of being honorable and honest
a rationalized mental attitude	position at right angles to the horizon
	the property of being upright in posture