"A hundred" is a commonly used term that refers to the numerical quantity of 100. However, there are various synonyms that can be used instead of "a hundred". Some of these synonyms include centenary, century, one hundred, C-note, a hundred fold, or one hundred units. Each synonym carries a unique connotation and may be appropriate in different contexts. For instance, "centenary" is commonly used in reference to the 100th anniversary of an occasion, while "C-note" is often used in informal settings such as music and slang. The use of synonyms can add variety and keep the language interesting and engaging.