different between nonback vs nonround

English

non- +? back

nonback (not comparable)

(phonetics) Not back; not produced at the back of the mouth.
- 1982, John J McCarthy, Formal problems in semitic phonology and morphology:
  Therefore these facts are doubly anomalous, since they have not only gemination after a nonback vowel but also after a vowel that is stressed.
(medicine) Not of or pertaining to the back (rear side of the body).
- 1973, Lawrence W Friedmann, Lawrence Galton, Freedom From Backaches:
  As we have noted, back pain may stem from many nonback conditions, including peptic ulcer, prostate disease, kidney disease, retroverted uterus...

non- +? round

nonround (not comparable)

(of a shape) Not round.
(phonetics, of a vowel) Having qualities the opposite of a round vowel.
(psychology, of a number) Having a sharp or precise numeric value; having not been rounded.
- 2004, Amos Tversky, Preference, Belief, and Similarity [1], page 85:
  a round number (e.g., 100) was paired with a nonround number (e.g., 103).
- 2007 September 21, "Random Samples" in Science 317(5845), page 1657 [2]:
  The researchers hypothesize that everyday experience teaches us that round (imprecise) numbers are usually larger than nonround (sharp) numbers.

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