pluralization vs inflexion

pluralization and inflexion both are nouns.

Word	Noun	Adjective	Verb	Adverb
pluralization	Yes	No	No	No
inflexion	Yes	No	No	No

As nouns, inflexion is a hypernym of pluralization; that is, inflexion is a word with a broader meaning than pluralization:

pluralization: the act of pluralizing or attributing plurality to
inflexion: a change in the form of a word (usually by adding a suffix) to indicate a change in its grammatical function

Other hypernyms of pluralization include inflection.

pluralization (noun)	inflexion (noun)
the act of pluralizing or attributing plurality to	a change in the form of a word (usually by adding a suffix) to indicate a change in its grammatical function