The term 'two-footed creature' can be summarized by the crossword solution 'BIPED, ' which is a five-letter word. A BIPED is an animal that has two feet and walks on two legs, such as humans, birds, and some reptiles. Bipedalism is a form of locomotion that has evolved independently in several different species, and it is considered to be one of the most important adaptations for survival in many environments.