* Camaraderie: This captures the feeling of companionship and mutual trust associated with comrades.
* Friendship: This is a more general term, but it can work if you're focusing on the emotional bond between comrades.
* Solidarity: This emphasizes the shared goals and support among comrades.
* Loyalty: This highlights the unwavering commitment and faithfulness that comrades have to each other.
* Brotherhood/Sisterhood: These terms emphasize the strong, almost familial bond between comrades, especially in contexts like a military unit or political movement.
Ultimately, the best abstract noun for "comrade" will depend on the specific context and the message you want to convey.