abler and ablest.
John is abler than Mary at driving.
Max is the ablest student in the class when it comes to science.
Adjectives ending in -able are base forms. E. g.,fashion+able - > comparative: more fashionable -> superlative: (the)most fashionable.
"Higher" is the comparative of high. The superlative is highest.
abler, ablest
'Next' is a superlative; it means 'nearest'. The positive is therefore 'near' and the comparative is 'nearer'.
last
harmful
abler, ablest
abler, ablest
desire-able and desireabler
finer, finest
stronger and strongest
older, oldest