brainwave vs discovery

brainwave and discovery both are nouns.

Word	Noun	Adjective	Verb	Adverb
brainwave	Yes	No	No	No
discovery	Yes	No	No	No

As nouns, discovery is a hyponym of brainwave; that is, discovery is a word with a more specific, narrower meaning than brainwave:

brainwave: the clear (and often sudden) understanding of a complex situation
discovery: a productive insight

Other hyponyms of brainwave include light, revelation, breakthrough, find, flash.

brainwave (noun)	discovery (noun)
the clear (and often sudden) understanding of a complex situation	the act of discovering something
(neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph	a productive insight
	something that is discovered
	(law) compulsory pretrial disclosure of documents relevant to a case; enables one side in a litigation to elicit information from the other side concerning the facts in the case