os pubis vs pubic bone

os pubis and pubic bone both are nouns.

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

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

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

Other synonyms of os pubis include pubis.

os pubis (noun)	pubic bone (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