Words are formed in steps, with one ax attaching
to a complete word, which can be a free word or a
morphological complex word.
Axes in general can only combine with words of
a single part of speech. (e.g., "-able" and
e-"
only combine with verbs). Also, the words axes
form after combination are usually of a single part of
speech as well, not necessarily the same as the words
with which it combines. ("-able" forms adjectives,
e-" forms verbs).