pelvis vs pelvic

pelvis is a noun but pelvic is not a noun.

Word	Noun	Adjective	Verb	Adverb
pelvis	Yes	No	No	No
pelvic	No	Yes	No	No

pelvis (noun)	pelvic (noun)
the structure of the vertebrate skeleton supporting the lower limbs in humans and the hind limbs or corresponding parts in other vertebrates
a structure shaped like a funnel in the outlet of the kidney into which urine is discharged before passing into the ureter

pelvis (adjective)	pelvic (adjective)
	of or relating to the pelvis