upgrade vs bring up

upgrade is a noun but bring up is not a noun.

Word	Noun	Adjective	Verb	Adverb
upgrade	Yes	No	Yes	No
bring up	No	No	Yes	No

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

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

upgrade (noun)	bring up (noun)
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)

upgrade (verb)	bring up (verb)
to improve what was old or outdated	cause to load (an operating system) and start the initial processes
give better travel conditions to	make reference to
get better travel conditions	put forward for consideration or discussion
rate higher; raise in value or esteem	summon into action or bring into existence, often as if by magic
give a promotion to or assign to a higher position	raise from a lower to a higher position
	cause to come to a sudden stop
	look after a child until it is an adult
	promote from a lower position or rank