The term 'Nay Opposer' refers to someone who disagrees with a negative statement or opinion. The crossword solutions for this term are 'YEA' and 'AYE, ' both of which mean 'YES' in different contexts. YEA is an archaic term that is still used in some religious contexts, while AYE is a more modern term that is used in many English-speaking countries. Both terms indicate agreement with a positive statement or opinion, which is the opposite of a Nay Opposer.