pull vs pull down

pull is a noun but pull down is not a noun.

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

pull (noun)	pull down (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 down (verb)
strain abnormally	cause to come or go down
take away	tear down so as to make flat with the ground
take sides with; align oneself with; show strong sympathy for
cause to move by pulling
tear or be torn violently
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