innominate bone vs hipbone

innominate bone and hipbone both are nouns.

Word	Noun	Adjective	Verb	Adverb
innominate bone	Yes	No	No	No
hipbone	Yes	No	No	No

As nouns, innominate bone and hipbone are synonyms defined as:

innominate bone and hipbone: large flaring bone forming one half of the pelvis; made up of the ilium and ischium and pubis

innominate bone (noun)	hipbone (noun)
large flaring bone forming one half of the pelvis; made up of the ilium and ischium and pubis	large flaring bone forming one half of the pelvis; made up of the ilium and ischium and pubis