upgrade vs entitle

upgrade is a noun but entitle is not a noun.

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

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

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

upgrade (noun)	entitle (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)	entitle (verb)
to improve what was old or outdated	give a title to
give better travel conditions to	give the right to
get better travel conditions	give a title to someone; make someone a member of the nobility
rate higher; raise in value or esteem
give a promotion to or assign to a higher position