fall back vs utilise

fall back and utilise both are verbs.

Word	Noun	Adjective	Verb	Adverb
fall back	No	No	Yes	No
utilise	No	No	Yes	No

As verbs, utilise is a hypernym of fall back; that is, utilise is a word with a broader meaning than fall back:

fall back: have recourse to
utilise: put into service; make work or employ for a particular purpose or for its inherent or natural purpose

Other hypernyms of fall back include apply, employ, use, utilize.

fall back (verb)	utilise (verb)
go back to bad behavior	put into service; make work or employ for a particular purpose or for its inherent or natural purpose
retreat
hang (back) or fall (behind) in movement, progress, development, etc.
fall backwards and down
move back and away from
have recourse to