mastoid vs mastoid process

mastoid and mastoid process both are nouns.

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

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

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

Other synonyms of mastoid include mastoid bone, mastoidal.

mastoid (noun)	mastoid process (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

mastoid (adjective)	mastoid process (adjective)
relating to or resembling a nipple
of or relating to or in the region of the mastoid process