KEY: Permeable.
SYN: Penetrable, pervadible, percolable.
ANT: Impenetrable, impermeable.

• Coincidence
• Coincide, [See AGREE]
• Cold, [See FRIGID]
• {[colilbit]?}
• Collate
• Collateral
• Colleague
• Collect
• Collected
• Collection
• Collision
• Collocate
• Collocation, [See COLLOCATE]
• Colloquy
• Colluctation
• Collusion
• Color
• Colorable
• Colossal, [See GIGANTIC]
• Combat
• Combat \v
• Combination
• Comely
• Comfortable
• Comfortless, [See COMFORTABLE]