Antonyms are words that have opposite meanings to a particular word. For "Small Nucleolar Ribonucleoproteins," there are many possible antonyms, such as "large," "big," "brawny," "giant," "huge," and "oversized." These words imply a larger size or greater mass than the original word. Other possible antonyms could include "simple," "uncomplicated," "unadorned," or "basic," which suggest a lack of complexity or intricacy. Yet another set of antonyms could be "unimportant," "insignificant," or "trivial," which indicate a lack of value or significance.