weapon-n; 2 Senses

Sense Number 1: an instrument of fighting or killing, artifact or natural

Commentary: WEAPON[+entity][+instrument][+fighting][+artifact/+substance/+anatomy]

There is increasing concern about the proliferation of nuclear weapons.
A professional boxer's hands are considered to be lethal weapons.
These chemicals can be used as weapons of mass destruction.
The prisoners made weapons out of plastic spoons.
A cat can use it's claws as a weapon of self defense.

WordNet 3.0 Sense Numbers: 1

Sense Number 2: a manner or method of contention

Commentary: WEAPON[+activity][+method][+contention][+persuasion/+dissuasion]
NOTE: a figurative extension of Sense 1

One of his weapons has always been the threat of resignation.
She used all her rhetorical weapons to win the argument.
Their crew won the sailboat race with the weapons of experience and better training.

WordNet 3.0 Sense Numbers: 2