The term 'capable of making mistakes' can be summarized by two crossword solutions: FALLIBLE (8 letters) and HUMAN (5 letters). FALLIBLE means 'liable to make mistakes or be deceived' while HUMAN refers to the species Homo sapiens, which is characterized by its capacity for abstract reasoning, language, and problem solving. Both terms imply that mistakes are a natural part of life and that humans are capable of making them.