Device is the tool. Devise is the verb: to invent a plan. A measuring device. Devise a schedule. Diction as a set is in word choice.
Object versus invent
If you can swap in gadget, use device. If you can swap in invent, use devise. Devise a gadget is legal; device a plan is not.
Breath versus breathe is another noun-verb pair, in breath versus breathe. Advise versus advice is in advise versus advice. Grammar overall is in ACT grammar rules.
The bottom line
Tool: device. Invent: devise.
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