The word rationalization is a noun. It is the process of rationalizing.
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Rationalize is a verb because it is an action. To rationalize is to explain or to justify something, typically an irrational or malicious deed.
For instance:
To rationalize his misdeed of stealing a cookie, Jimmy claimed that he was extremely hungry and could not wait any longer to eat.
part of speech
Adjective
What part of speech is thaw
The part of speech for oscillate is verb.
An adjective is a part of speech.