auditory ossicle vs ossiculum

auditory ossicle and ossiculum both are nouns.

Word	Noun	Adjective	Verb	Adverb
auditory ossicle	Yes	No	No	No
ossiculum	Yes	No	No	No

As nouns, ossiculum is a hypernym of auditory ossicle; that is, ossiculum is a word with a broader meaning than auditory ossicle:

auditory ossicle: ossicles of the middle ear that transmit acoustic vibrations from the eardrum to the inner ear
ossiculum: a small bone; especially one in the middle ear

Other hypernyms of auditory ossicle include bonelet, ossicle.

auditory ossicle (noun)	ossiculum (noun)
ossicles of the middle ear that transmit acoustic vibrations from the eardrum to the inner ear	a small bone; especially one in the middle ear