The crossword solution for the term PART OF PABA is AMINO. Amino acids are organic compounds that contain amine (-NH2) and carboxyl (-COOH) functional groups, along with a side chain specific to each amino acid. They are the building blocks of proteins, which are essential components of all living organisms. PABA (para-aminobenzoic acid) is an amino acid found in many foods and used as a dietary supplement. It is also used in some sunscreens to protect against ultraviolet light.