pull vs pull back

pull is a noun but pull back is not a noun.

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

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

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

pull: apply force so as to cause motion towards the source of the motion
pull back: use a surgical instrument to hold open (the edges of a wound or an organ)

pull (noun)	pull back (noun)
the act of pulling; applying force to move something toward or with you
a slow inhalation (as of tobacco smoke)
a sustained effort
a device used for pulling something
special advantage or influence
the force used in pulling
a sharp strain on muscles or ligaments

pull (verb)	pull back (verb)
strain abnormally	make a retreat from an earlier commitment or activity
take away	move to a rearward position; pull towards the back
take sides with; align oneself with; show strong sympathy for	stretch back a bowstring (on an archer's bow)
cause to move by pulling	use a surgical instrument to hold open (the edges of a wound or an organ)
tear or be torn violently	pull back or move away or backward
direct toward itself or oneself by means of some psychological power or physical attributes
hit in the direction that the player is facing when carrying through the swing
apply force so as to cause motion towards the source of the motion
strip of feathers
remove, usually with some force or effort; also used in an abstract sense
steer into a certain direction
move into a certain direction
operate when rowing a boat
bring, take, or pull out of a container or from under a cover
rein in to keep from winning a race
cause to move in a certain direction by exerting a force upon, either physically or in an abstract sense
perform an act, usually with a negative connotation