kyphotic vs crookback

kyphotic is not a noun while crookback is a noun.

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

As adjectives, kyphotic and crookback are synonyms defined as:

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

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

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

kyphotic (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