localism vs non-standard speech

localism and non-standard speech both are nouns.

Word	Noun	Adjective	Verb	Adverb
localism	Yes	No	No	No
non-standard speech	Yes	No	No	No

As nouns, non-standard speech is a hypernym of localism; that is, non-standard speech is a word with a broader meaning than localism:

localism: a phrase or pronunciation that is peculiar to a particular locality
non-standard speech: speech that differs from the usual accepted, easily recognizable speech of native adult members of a speech community

localism (noun)	non-standard speech (noun)
a partiality for some particular place	speech that differs from the usual accepted, easily recognizable speech of native adult members of a speech community
a phrase or pronunciation that is peculiar to a particular locality