modulation vs modulate

modulation is a noun but modulate is not a noun.

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

modulation (noun)	modulate (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

modulation (verb)	modulate (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