electronics vs echo

electronics and echo both are nouns.

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

electronics (noun)	echo (noun)
the branch of physics that deals with the emission and effects of electrons and with the use of electronic devices	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