Flute Accompaniment

[Br. Gabriel-Marie | SSPX]

In my piece I have a piano staff with the music on the 
bottom staff. In the upper staff it is supposed to be notes 
for recorder or flute accompaniment.  In the original the 
flute notes and its staff are all a bit smaller in size.  
What do you call those smaller notes?  I want to make the 
entire top staff + the notes just smaller so it is obvious 
to the singers not to try and sing the accompaniment.  How 
do I do that?
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