The word "twenty-third" is an ordinal number which indicates the position of a thing or a person in a list. Some synonyms for the word "twenty-third" include "23rd," "twenty-thirdly," "twenty-third in line," "twenty-third place," "twenty-third position," and "twenty-third rank." These synonyms are used interchangeably with the word "twenty-third" to indicate the same thing, but they provide variety in writing or speech. It is important to use synonyms to avoid overuse of the same word, which can make the text sound repetitive and monotonous. By using synonyms, one can make the language more interesting and engaging.