echo vs bong

echo and bong both are nouns.

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

As verbs, bong is a hyponym of echo; that is, bong is a word with a more specific, narrower meaning than echo:

Other hyponyms of echo include consonate, reecho, reecho.

echo (noun)	bong (noun)
an imitation or repetition	a dull resonant sound as of a bell
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