Based on their fighting style:
* Conventional forces: This refers to traditional military units with established structure, equipment, and tactics.
* Regular army: Similar to "conventional forces," emphasizing the organized and formal nature of their operation.
Based on their goals and affiliation:
* Government forces: This contrasts with guerrillas who often fight against the government.
* Peacekeepers: This emphasizes a non-violent approach to conflict resolution.
* Diplomats: This contrasts with guerrillas who use force to achieve their aims.
Based on their organization:
* Organized military: Emphasizing the structured and hierarchical nature of a regular military.
* Formal army: Similar to "organized military," highlighting the official and recognized status of a traditional army.
Ultimately, the best antonym for "guerrillas" depends on the specific context and the aspect you wish to emphasize.