back away vs pull back

back away and pull back both are verbs.

Word	Noun	Adjective	Verb	Adverb
back away	No	No	Yes	No
pull back	No	No	Yes	No

As verbs, back away and pull back are synonyms defined as:

back away and pull back: make a retreat from an earlier commitment or activity

Other synonyms of back away include back out, crawfish, crawfish out, pull in one's horns, retreat, withdraw.

back away (verb)	pull back (verb)
make a retreat from an earlier commitment or activity	make a retreat from an earlier commitment or activity
	move to a rearward position; pull towards the back
	stretch back a bowstring (on an archer's bow)
	use a surgical instrument to hold open (the edges of a wound or an organ)
	pull back or move away or backward