repeat vs echo

repeat and echo both are nouns.

Word	Noun	Adjective	Verb	Adverb
repeat	Yes	No	Yes	No
echo	Yes	No	Yes	No

As verbs, repeat and echo are synonyms defined as:

repeat (noun)	echo (noun)
an event that repeats	an imitation or repetition
	the repetition of a sound resulting from reflection of the sound waves
	a reflected television or radio or radar beam
	a close parallel of a feeling, idea, style, etc.
	a reply that repeats what has just been said

repeat (verb)	echo (verb)
happen or occur again	to say again or imitate
to say, state, or perform again	ring or echo with sound
to say again or imitate	bring to mind
make or do or perform again
repeat an earlier theme of a composition
do over