backup vs approval

backup and approval both are nouns.

Word	Noun	Adjective	Verb	Adverb
backup	Yes	No	No	No
approval	Yes	No	No	No

As nouns, approval is a hypernym of backup; that is, approval is a word with a broader meaning than backup:

Other hypernyms of backup include approving, blessing.

backup (noun)	approval (noun)
the act of providing approval and support	the formal act of approving
(computer science) a copy of a file or directory on a separate storage device	a message expressing a favorable opinion
a musical part (vocal or instrumental) that supports or provides background for other musical parts	a feeling of liking something or someone good
someone who takes the place of another (as when things get dangerous or difficult)	acceptance as satisfactory
an accumulation caused by clogging or a stoppage