echo vs reflexion

echo and reflexion both are nouns.

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

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

echo: the repetition of a sound resulting from reflection of the sound waves
reflexion: the ability to reflect beams or rays

Other hypernyms of echo include reflection, reflectivity.

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

Other hypernyms of echo include reflection, reflectivity.

echo (noun)	reflexion (noun)
an imitation or repetition	the image of something as reflected by a mirror (or other reflective material)
the repetition of a sound resulting from reflection of the sound waves	the ability to reflect beams or rays
a reflected television or radio or radar beam	a likeness in which left and right are reversed
a close parallel of a feeling, idea, style, etc.	a calm, lengthy, intent consideration
a reply that repeats what has just been said	a remark expressing careful consideration
	expression without words
	the phenomenon of a propagating wave (light or sound) being thrown back from a surface