brain wave vs bioelectricity

brain wave and bioelectricity both are nouns.

Word	Noun	Adjective	Verb	Adverb
brain wave	Yes	No	No	No
bioelectricity	Yes	No	No	No

As nouns, bioelectricity is a hypernym of brain wave; that is, bioelectricity is a word with a broader meaning than brain wave:

brain wave: (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph
bioelectricity: electric phenomena in animals or plants

brain wave (noun)	bioelectricity (noun)
(neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph	electric phenomena in animals or plants