echo vs analog

echo and analog both are nouns.

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

As nouns, analog is a hypernym of echo; that is, analog is a word with a broader meaning than echo:

Other hypernyms of echo include analogue, parallel.

echo (noun)	analog (noun)
an imitation or repetition	something having the property of being analogous to something else
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

echo (adjective)	analog (adjective)
	of a circuit or device having an output that is proportional to the input