repetition vs echolalia

repetition and echolalia both are nouns.

Word	Noun	Adjective	Verb	Adverb
repetition	Yes	No	No	No
echolalia	Yes	No	No	No

As nouns, echolalia is a hyponym of repetition; that is, echolalia is a word with a more specific, narrower meaning than repetition:

repetition: the act of doing or performing again
echolalia: (psychiatry) mechanical and meaningless repetition of the words of another person (as in schizophrenia)

repetition (noun)	echolalia (noun)
the act of doing or performing again	(psychiatry) mechanical and meaningless repetition of the words of another person (as in schizophrenia)
the repeated use of the same word or word pattern as a rhetorical device	an infant's repetition of sounds uttered by others
an event that repeats