The term 'skulls' can be represented by the six-letter word 'CRANIA'. The term 'skulls' refers to the bony structure that forms the head and face of a vertebrate animal. It is composed of several bones, including the mandible, maxilla, frontal, parietal, temporal, occipital, and sphenoid. Skulls are important for protecting the brain and sensory organs, as well as providing attachment points for muscles that control facial expressions.