Holoenzyme is a complex of a protein and a cofactor that performs a specific biological function. Synonyms for the word "holoenzyme" include activated enzyme, complete enzyme, catalytic enzyme, and apoenzyme. Apoenzyme is the inactive form of the holoenzyme, which becomes active after binding with a cofactor. The activated enzyme is the most commonly used synonym and refers to the holoenzyme's ability to catalyze a chemical reaction. Complete enzyme and catalytic enzyme both emphasize the holoenzyme's ability to perform a specific function. Overall, the different synonyms for holoenzyme emphasize different aspects of this important biological molecule.