auditory meatus vs auditory canal

auditory meatus and auditory canal both are nouns.

Word	Noun	Adjective	Verb	Adverb
auditory meatus	Yes	No	No	No
auditory canal	Yes	No	No	No

As nouns, auditory meatus and auditory canal are synonyms defined as:

auditory meatus and auditory canal: either of the passages in the outer ear from the auricle to the tympanic membrane

Other synonyms of auditory meatus include acoustic meatus, ear canal, external auditory canal.

auditory meatus (noun)	auditory canal (noun)
either of the passages in the outer ear from the auricle to the tympanic membrane	either of the passages in the outer ear from the auricle to the tympanic membrane