different between frontless vs frontness

English

front +? -less

frontless (comparative more frontless, superlative most frontless)

front +? -ness

frontness (uncountable)

(phonetics) Quality of being a front vowel.
Andrew Spencer (1996), Phonology: theory and description, p. 25 :
The most important aspects of vowel quality are tongue height, frontness/backness and lip rounding.

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