echo vs reflectivity

echo and reflectivity both are nouns.

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

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

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

Other hypernyms of echo include reflection, reflexion.

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

Other hypernyms of echo include reflection, reflexion.

echo (noun)	reflectivity (noun)
an imitation or repetition	the ability to reflect beams or rays
the repetition of a sound resulting from reflection of the sound waves	the capability of quiet thought or contemplation
a reflected television or radio or radar beam	the fraction of radiant energy that is reflected from a surface
a close parallel of a feeling, idea, style, etc.
a reply that repeats what has just been said