SA vs militia

SA and militia both are nouns.

Word	Noun	Adjective	Verb	Adverb
SA	Yes	No	No	No
militia	Yes	No	No	No

As nouns, militia is a hypernym of SA; that is, militia is a word with a broader meaning than SA:

SA: Nazi militia created by Hitler in 1921 that helped him to power but was eclipsed by the SS after 1943
militia: civilians trained as soldiers but not part of the regular army

Other hypernyms of SA include reserves.

SA (noun)	militia (noun)
Nazi militia created by Hitler in 1921 that helped him to power but was eclipsed by the SS after 1943	civilians trained as soldiers but not part of the regular army
	the entire body of physically fit civilians eligible by law for military service