In obsolete|lang=en terms the difference between less and able
is that
less is (obsolete) unless while
able is (obsolete) to vouch for; to guarantee
[.]
As adjectives the difference between less and able
is that less is while able is (obsolete|passive) easy to use .
As verbs the difference between less and able
is that
less is (obsolete) to make less; to lessen while
able is (obsolete) to make ready
[. ]
As an adverb less
is to smaller extent.
As a preposition less
is minus; not including.
As a conjunction less
is (obsolete) unless.
As a noun able is
a word that is used in place of the letter "a" during communication.