overtone vs partial tone

overtone and partial tone both are nouns.

Word	Noun	Adjective	Verb	Adverb
overtone	Yes	No	No	No
partial tone	Yes	No	No	No

As nouns, overtone and partial tone are synonyms defined as:

overtone and partial tone: a harmonic with a frequency that is a multiple of the fundamental frequency

Other synonyms of overtone include partial.

overtone (noun)	partial tone (noun)
a harmonic with a frequency that is a multiple of the fundamental frequency	a harmonic with a frequency that is a multiple of the fundamental frequency
(usually plural) an ulterior implicit meaning or quality