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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