beta rhythm vs beta wave

beta rhythm and beta wave both are nouns.

Word	Noun	Adjective	Verb	Adverb
beta rhythm	Yes	No	No	No
beta wave	Yes	No	No	No

As nouns, beta rhythm and beta wave are synonyms defined as:

beta rhythm and beta wave: the normal brainwave in the encephalogram of a person who is awake and alert; occurs with a frequency between 12 and 30 hertz

beta rhythm (noun)	beta wave (noun)
the normal brainwave in the encephalogram of a person who is awake and alert; occurs with a frequency between 12 and 30 hertz	the normal brainwave in the encephalogram of a person who is awake and alert; occurs with a frequency between 12 and 30 hertz