pullback vs pull back

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

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

pullback (noun)	pull back (noun)
(military) the act of pulling back (especially an orderly withdrawal of troops)
a device (as a decorative loop of cord or fabric) for holding or drawing something back

pullback (verb)	pull back (verb)
	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