Camouflage and mimicry although they can sometimes be confused are different, while camouflage involves blending in with the surrounding environment, mimicry involves imitating a different organism for example.
Camouflage: An example of camouflage would be a leopard that gets lost in its environment and is, therefore, more difficult to detect by its prey.
Mimicry: An example of mimicry are certain species of caterpillars that resemble snakes by their design and thus scare away predators.
Structural: Structural adaptations are parts of an organism that help it survive in its environment. An example of structural adaptation is cacti, which have spines instead of leaves. The spines allow them to lose less water in the desertic climate.