The term 'fixed firmly' can be described by three words: CEMENTED (8 letters), MOORED (6 letters), and Planted (7 letters). CEMENTED means to attach something securely with a strong adhesive material, such as cement. MOORED means to secure a boat or ship in a particular place by means of an anchor or rope. Planted means to put something into the ground and cover it with soil. All three words describe the idea of fixing something firmly in place.