ilium vs pelvis

ilium and pelvis both are nouns.

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

ilium (noun)	pelvis (noun)
the upper and widest of the three bones making up the hipbone	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