"No one" is a term used to refer to the absence of any person or individual in a given situation or context. There are several synonyms that can be used to replace this phrase. Some of the common synonyms include "nobody", "none", "not a soul", "not a single person", and "no individual". Other synonyms that can be used in certain situations include "zero", "zilch", "NIL", "nothing", and "nada". Using appropriate synonyms for "no one" can help add variety and depth to your writing while ensuring that your meaning remains clear and precise.