mastoid process vs mastoid bone

mastoid process and mastoid bone both are nouns.

Word	Noun	Adjective	Verb	Adverb
mastoid process	Yes	No	No	No
mastoid bone	Yes	No	No	No

As nouns, mastoid process and mastoid bone are synonyms defined as:

mastoid process and mastoid bone: process of the temporal bone behind the ear at the base of the skull

Other synonyms of mastoid process include mastoid, mastoidal.

mastoid process (noun)	mastoid bone (noun)
process of the temporal bone behind the ear at the base of the skull	process of the temporal bone behind the ear at the base of the skull