pluralisation vs inflexion

pluralisation and inflexion both are nouns.

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

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

pluralisation: 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 pluralisation include inflection.

pluralisation (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