Breaking words down in more than one way

There are some cases in which morphemes can be ambiguous.

Take the following word:

unionized

The more familiar meaning is "formed into a union". The other, less commonly known meaning comes from chemistry: "not converted into ions"; it's actually the word ionized with the un- prefix. This is an example of a homograph, as the words can have two pronunciations and different meanings altogether but are spelled the same.

The root words are different: in the first case, it's union, and in the second case it's ion. Here's the morpheme breakdown of both meanings of unionized:

unionized:

union : root word
-ize : changes a noun into a verb (union -> unionize)
-ed : past tense (unionize -> unionized)

unionized:

ion : root word
-ize : changes a noun into a verb (ion -> ionize)
un- : "not"
(ionize -> unionize)
-ed : past tense (unionize -> unionized)

In the second case, notice that the order matters: the un- prefix is applied after -ize, as there isn't a word such as "un-ion".
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