The term IT TURNS LITMUS PAPER BLUE is referring to an ALKALI or BASE, which are both 6 and 4 letter words respectively. An ALKALI is a type of chemical compound that has a pH greater than 7 and is usually soluble in water. A BASE is a substance that can accept protons from other substances and can also neutralize acids. Alkalis and bases are both capable of turning litmus paper blue, which is a type of paper that changes color when exposed to different types of acids and bases.