overtone vs plural form

overtone and plural form both are nouns.

Word	Noun	Adjective	Verb	Adverb
overtone	Yes	No	No	No
plural form	Yes	No	No	No

overtone (noun)	plural form (noun)
a harmonic with a frequency that is a multiple of the fundamental frequency	the form of a word that is used to denote more than one
(usually plural) an ulterior implicit meaning or quality