pitch contour vs modulation

pitch contour and modulation both are nouns.

Word	Noun	Adjective	Verb	Adverb
pitch contour	Yes	No	No	No
modulation	Yes	No	No	No

As nouns, pitch contour and modulation are synonyms defined as:

Other synonyms of pitch contour include intonation.

pitch contour (noun)	modulation (noun)
rise and fall of the voice pitch	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