Become extinct is a term used to describe when a species of animal or plant no longer exists. This can be caused by a variety of factors, such as climate change, overhunting, or disease. The crossword solutions for this term include DIE (3 letters), DISAPPEAR (9 letters), END (3 letters), DODO (4 letters), MOA (3 letters), moas (4 letters), dieoff (6 letters), dieout (6 letters), and dieaway (7 letters). Each of these words can be used to describe the process of a species becoming extinct.