Is there a special terminology that would refer to the s/z sound
distinction in the word 'used' in the following sentences:

My grandfather used to make 'moonshine" from wild plums.

My grandfather used wild plums to make 'moonshine." 

I use an /s/ in the first sentence and a /z/ in the second.

P.S.  He called his concoction "moonshine" and visitors loved it.

Scott Catledge

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