upgrade vs tenure

upgrade and tenure both are nouns.

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

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

Other hyponyms of upgrade include bring up, spot promote, ennoble, entitle, gentle, favor, favour, prefer, brevet.

upgrade (noun)	tenure (noun)
the act of improving something (especially machinery) by raising it to a higher grade (as by adding or replacing components)	the right to hold property; part of an ancient hierarchical system of holding lands
hardware that provides better performance than an earlier version did	the term during which some position is held
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)

upgrade (verb)	tenure (verb)
to improve what was old or outdated	give life-time employment to
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