uprightness vs erectness

uprightness and erectness both are nouns.

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

As nouns, uprightness and erectness are synonyms defined as:

Other synonyms of uprightness include verticality, verticalness.

As nouns, uprightness and erectness are synonyms defined as:

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