pelvis vs appendicular skeleton

pelvis and appendicular skeleton both are nouns.

Word	Noun	Adjective	Verb	Adverb
pelvis	Yes	No	No	No
appendicular skeleton	Yes	No	No	No

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