:: : : I also found this paper viewable in [ frustratingly ] short previews here, which discusses the Modern French and English conflation of the Latin suffix "-bilis " with the ME free morpheme " able " thus restricting its modern acceptable conjunctions only to verbs despite that not being the original case ( several examples are given like OF " aidable "-looks like " helpable " but actually means " helpful "; " decevable "-looks likes " deceivable " but actually means " full of deceptions ", " deceiving " ).
