upgrade vs brevet

upgrade and brevet both are nouns.

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

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

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

upgrade (noun)	brevet (noun)
the act of improving something (especially machinery) by raising it to a higher grade (as by adding or replacing components)	a document entitling a commissioned officer to hold a higher rank temporarily (but without higher pay)
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)

upgrade (verb)	brevet (verb)
to improve what was old or outdated	promote somebody by brevet, in the military
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