The term 'challenge word' can refer to a variety of different things. In this case, the two crossword solutions for the term are 'DARE' and 'ELSE'. DARE stands for 'Drug Abuse Resistance Education', which is a program that teaches children how to resist peer pressure and live drug-free lives. ELSE is a term used to indicate an alternative choice or option. Together, these two words suggest that when faced with a challenge, one should consider all available options before making a decision.