localism vs partisanship

localism and partisanship both are nouns.

Word	Noun	Adjective	Verb	Adverb
localism	Yes	No	No	No
partisanship	Yes	No	No	No

As nouns, partisanship is a hypernym of localism; that is, partisanship is a word with a broader meaning than localism:

localism: a partiality for some particular place
partisanship: an inclination to favor one group or view or opinion over alternatives

Other hypernyms of localism include partiality.

localism (noun)	partisanship (noun)
a partiality for some particular place	an inclination to favor one group or view or opinion over alternatives
a phrase or pronunciation that is peculiar to a particular locality