crookbacked vs crookback

crookbacked is not a noun while crookback is a noun.

Word	Noun	Adjective	Verb	Adverb
crookbacked	No	Yes	No	No
crookback	Yes	Yes	No	No

As adjectives, crookbacked and crookback are synonyms defined as:

crookbacked and crookback: characteristic of or suffering from kyphosis, an abnormality of the vertebral column

Other synonyms of crookbacked include gibbous, humpbacked, humped, hunchbacked, kyphotic.

crookbacked (noun)	crookback (noun)
	a person whose back is hunched because of abnormal curvature of the upper spine

crookbacked (adjective)	crookback (adjective)
characteristic of or suffering from kyphosis, an abnormality of the vertebral column	characteristic of or suffering from kyphosis, an abnormality of the vertebral column