Clamber

Part of speech: noun (n.)

The act of clambering. T. Moore.

Part of speech: verb (v.)

To climb with difficulty, or with hands and feet; -- also used figuratively. The narrow street that clambered toward the mill. Tennyson.

Part of speech: verb (v.)

To ascend by climbing with difficulty. Clambering the walls to eye him. Shak.