follow vs fall back

follow and fall back both are verbs.

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

As verbs, fall back is a hyponym of follow; that is, fall back is a word with a more specific, narrower meaning than follow:

follow: to travel behind, go after, come after
fall back: hang (back) or fall (behind) in movement, progress, development, etc.

Other hyponyms of follow include dawdle, fall behind, lag, tailgate, shadow, carry.

follow (verb)	fall back (verb)
behave in accordance or in agreement with	go back to bad behavior
keep informed	retreat
keep to	hang (back) or fall (behind) in movement, progress, development, etc.
follow, discover, or ascertain the course of development of something	fall backwards and down
grasp the meaning	move back and away from
imitate in behavior; take as a model	have recourse to
perform an accompaniment to
to travel behind, go after, come after
travel along a certain course
follow in or as if in pursuit
keep under surveillance
choose and follow; as of theories, ideas, policies, strategies or plans
to subscribe to someone's updates on social media
to be subscribed to updates from another user on social media
act in accordance with someone's rules, commands, or wishes
be the successor (of)
follow with the eyes or the mind
work in a specific place, with a specific subject, or in a specific function
accept and follow the leadership or command or guidance of
adhere to or practice
be later in time
come after in time, as a result
be next
to bring something about at a later time than
to be the product or result
come as a logical consequence; follow logically