passing note vs passing tone

passing note and passing tone both are nouns.

Word	Noun	Adjective	Verb	Adverb
passing note	Yes	No	No	No
passing tone	Yes	No	No	No

As nouns, passing note and passing tone are synonyms defined as:

passing note and passing tone: a nonharmonic note inserted for transition between harmonic notes

passing note (noun)	passing tone (noun)
a nonharmonic note inserted for transition between harmonic notes	a nonharmonic note inserted for transition between harmonic notes