withdraw vs pull back

withdraw and pull back both are verbs.

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

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

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

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

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

Other synonyms of withdraw include draw back, move back, pull away, recede, retire, retreat.

withdraw (verb)	pull back (verb)
keep away from others	make a retreat from an earlier commitment or activity
remove something concrete, as by lifting, pushing, or taking off, or remove something abstract	move to a rearward position; pull towards the back
make a retreat from an earlier commitment or activity	stretch back a bowstring (on an archer's bow)
take back what one has said	use a surgical instrument to hold open (the edges of a wound or an organ)
release from something that holds fast, connects, or entangles	pull back or move away or backward
lose interest
pull back or move away or backward
remove (a commodity) from (a supply source)
cause to be returned
break from a meeting or gathering
withdraw from active participation
retire gracefully