The term STRONG ALKALINE is a combination of two words, with the first word being 'STRONG' and the second word being 'ALKALINE'. The crossword solution for this term is LYE, which is a type of STRONG ALKALINE substance. LYE is a highly caustic chemical that is used in a variety of industrial and household applications, such as soap-making, food preparation, and cleaning. It is also used in some medical treatments, such as the removal of warts.