grade vs upgrade

grade and upgrade both are nouns.

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

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

Other hyponyms of grade include rise, rising slope, downgrade.

As verbs, upgrade is a hyponym of grade; that is, upgrade is a word with a more specific, narrower meaning than grade:

grade (noun)	upgrade (noun)
a variety of cattle produced by crossbreeding with a superior breed	the act of improving something (especially machinery) by raising it to a higher grade (as by adding or replacing components)
a position on a scale of intensity or amount or quality	hardware that provides better performance than an earlier version did
the gradient of a slope or road or other surface	the property possessed by a slope or surface that rises
the height of the ground on which something stands	a reservation that is improved
a number or letter indicating quality (especially of a student's performance)	software that provides better performance than an earlier version did
a degree of ablaut	an upward slope or grade (as in a road)
a body of students who are taught together
one-hundredth of a right angle
a relative position or degree of value in a graded group

grade (verb)	upgrade (verb)
determine the grade of or assign a grade to	to improve what was old or outdated
assign a rank or rating to	give better travel conditions to
assign a grade or rank to, according to one's evaluation	get better travel conditions
level to the right gradient	rate higher; raise in value or esteem
	give a promotion to or assign to a higher position