modulate vs modulation

modulate is not a noun while modulation is a noun.

Word	Noun	Adjective	Verb	Adverb
modulate	No	No	Yes	No
modulation	Yes	No	No	No

modulate (noun)	modulation (noun)
	the act of modifying or adjusting according to due measure and proportion (as with regard to artistic effect)
	(electronics) the transmission of a signal by using it to vary a carrier wave; changing the carrier's amplitude or frequency or phase
	a musical passage moving from one key to another
	rise and fall of the voice pitch
	a manner of speaking in which the loudness or pitch or tone of the voice is modified

modulate (verb)	modulation (verb)
adjust the pitch, tone, or volume of
fix or adjust the time, amount, degree, or rate of
vary the frequency, amplitude, phase, or other characteristic of (electromagnetic waves)
vary the pitch of one's speech
change the key of, in music