reserves vs SA

reserves and SA both are nouns.

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

As nouns, SA is a hyponym of reserves; that is, SA is a word with a more specific, narrower meaning than reserves:

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

Other hyponyms of reserves include Storm Troops, Sturmabteilung, trainband.

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