weapon
1. [ noun ] (arms) any instrument or instrumentality used in fighting or hunting
Synonyms: weapon_system arm
Examples:

"he was licensed to carry a weapon"

Related terms: instrument weaponry gun sword knife projectile spear brass_knucks bow slasher sling nuclear_weapon pike flamethrower fire_ship tomahawk bow_and_arrow stun_baton w.m.d. Greek_fire weaponry
2. [ noun ] a means of persuading or arguing
Synonyms: artillery
Examples:

"he used all his conversational weapons"

Related terms: persuasion