kyphosis vs humpback

kyphosis and humpback both are nouns.

Word	Noun	Adjective	Verb	Adverb
kyphosis	Yes	No	No	No
humpback	Yes	No	No	No

As nouns, kyphosis and humpback are synonyms defined as:

kyphosis and humpback: an abnormal backward curve to the vertebral column

Other synonyms of kyphosis include hunchback.

kyphosis (noun)	humpback (noun)
The property of having an abnormal convex curvature in the cervical or lumbar regions of the spine.	large whalebone whale with long flippers noted for arching or humping its back as it dives
an abnormal backward curve to the vertebral column	a person whose back is hunched because of abnormal curvature of the upper spine
	an abnormal backward curve to the vertebral column