It would help to see the actual passage, but you described it clearly enough to sketch out, assuming F E D C
is step-wise it should be a descending line...
Above the staff S
means "strong beat" and W
means "weak beat". You didn't ask about the metrical accent of beats, but it seems generally appropriate to show.
The tones E D
are passing tones.
Regarding non-chord tones, accent is usually a matter of whether the note is at the onset of the beat. Accented notes are at the onset of the beat. Other notes will be unaccented. So...
The tones E D
are unaccented passing tones.
Some might say the eighth note level of beat subdivision gets some minor accent such that the third sixteenth note is slightly accented compared to the second and fourth sixteenths (S W s W
below the sixteenths group.) But I have never seen a non-chord tone chart of examples that actually classifies by accent with that level of detail. I have only seen NCT definitions where accent means placement on the initial down beat. So, you can regard these two passing tones as unaccented. But if you get into a deeper discussion of metrical subdivision and accent the third sixteenth has a slight accent.