Chromoproteins are a class of proteins that possess a pigment or chromophore that enables them to absorb, reflect, or emit light with different wavelengths. Synonyms for chromoprotein include pigmented protein, colored protein, photoprotein, fluoroprotein, and fluorescent protein. Pigmented proteins refer to the presence of a natural pigment in the protein while colored proteins encompass both natural and artificial pigments. Photoproteins denote light-sensitive proteins that undergo a chemical reaction upon light exposure. Fluoroproteins and fluorescent proteins refer to proteins that emit light after excitation by another light source. These synonyms are commonly used in research studies on proteins, biotechnology, and medical imaging.