pubic bone vs os pubis

pubic bone and os pubis both are nouns.

Word	Noun	Adjective	Verb	Adverb
pubic bone	Yes	No	No	No
os pubis	Yes	No	No	No

As nouns, pubic bone and os pubis are synonyms defined as:

pubic bone and os pubis: one of the three sections of the hipbone; together these two bones form the front of the pelvis

Other synonyms of pubic bone include pubis.

pubic bone (noun)	os pubis (noun)
one of the three sections of the hipbone; together these two bones form the front of the pelvis	one of the three sections of the hipbone; together these two bones form the front of the pelvis