pullback vs holding device

pullback and holding device both are nouns.

Word	Noun	Adjective	Verb	Adverb
pullback	Yes	No	No	No
holding device	Yes	No	No	No

As nouns, holding device is a hypernym of pullback; that is, holding device is a word with a broader meaning than pullback:

pullback: a device (as a decorative loop of cord or fabric) for holding or drawing something back
holding device: a device for holding something

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