ear trumpet vs hearing aid

ear trumpet and hearing aid both are nouns.

Word	Noun	Adjective	Verb	Adverb
ear trumpet	Yes	No	No	No
hearing aid	Yes	No	No	No

As nouns, ear trumpet and hearing aid are synonyms defined as:

ear trumpet and hearing aid: a conical acoustic device formerly used to direct sound to the ear of a hearing-impaired person

ear trumpet (noun)	hearing aid (noun)
a conical acoustic device formerly used to direct sound to the ear of a hearing-impaired person	a conical acoustic device formerly used to direct sound to the ear of a hearing-impaired person
	an electronic device that amplifies sound and is worn to compensate for poor hearing