downgrade vs upgrade

downgrade and upgrade both are nouns.

Word	Noun	Adjective	Verb	Adverb
downgrade	Yes	No	Yes	No
upgrade	Yes	No	Yes	No

downgrade (noun)	upgrade (noun)
the property possessed by a slope or surface that descends	the act of improving something (especially machinery) by raising it to a higher grade (as by adding or replacing components)
	hardware that provides better performance than an earlier version did
	the property possessed by a slope or surface that rises
	a reservation that is improved
	software that provides better performance than an earlier version did
	an upward slope or grade (as in a road)

downgrade (verb)	upgrade (verb)
rate lower; lower in value or esteem	to improve what was old or outdated
	give better travel conditions to
	get better travel conditions
	rate higher; raise in value or esteem
	give a promotion to or assign to a higher position