There are two possibilities Scharfschuetze (sharpshooter,marksman, sniper) or Heckenschuetze which is probably more what you want.
The word Sniper comes from a play on words by British soldiers in India as early as 1773. Here troops hunted the Snipe, a small, quick bird that was difficult to shoot. Successful shooters were dubbed Snipers. However the true Sniper as we know him today was developed by the German Army of WW1.
The Romans did not have snipers, and as a result no word for sniper.
Just a sniper theres no indefintie word for it.
murderer
If you are referring to the German sniper (shot by Pvt. Daniel Jackson [Barry Pepper]) who shoots Pvt. Adrian Caparzo (Vin Diesel) in the courtyard overlooked by the bombed out apartment with the French family, it is likely (if authentic) a Karabiner Kar 98K fitted with a scope. This is a guess however, as (if memory serves) it is a manual load, bolt action rifle, so could not have been a Walther Gewehr 43 which is a semi-automatic weapon.
sniper is actually sunaippa now but it was originally 狙撃兵 Sogeki-hei
Chre is not a German word
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"Sniper" is comparable to pronouncing "Diaper", just with an "Sn" at the front instead of the "Dia".
"mit" is the German word for "with".
The German word for their is "Ihre."
The word FROM in German is von