catalyst
/ˈkætəɫəst/
noun
(chemistry) a substance that causes a chemical reaction to happen at a faster rate without undergoing any chemical change itself
"Catalyst speeds up reaction."
"A catalyst is a substance that lowers the activation energy of a chemical reaction"
alcohol
/ˈælkəˌhɑl/
noun
a compound with a hydroxyl group (-OH) attached to a carbon atom, widely used as solvents, fuels, and in pharmaceutical and chemical synthesis
"Beer and wine contain alcohol"
"This compound contains a hydroxyl group attached to a carbon atom, making it a common alcohol used in many products."