The best replacement for deadly weapon is dangerous instrument.

The best alternatives to deadly weapon are rated as following:
★★★★★  dangerous instrument
★★  attempted murder
★  aggravated assault
★  firearm

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Speaking about deadly weapon, one probably shouldn't forget about intent.

Other search terms related to deadly weapon and their ratings are:
★★★★★ intent
★★★ bodily harm
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deadly weapon
dangerous instrument
attempted murder