There are several synonyms for the word "twelfth part." Some of the most common include "one twelfth," "1/12," "a fraction of twelve," "a twelfth fraction," "one out of twelve," and "12.5 percent." These synonyms all refer to a division of something into twelve equal parts. For example, if a pizza is divided into twelve slices, one slice would be referred to as a "twelfth part," or any of the synonyms listed above. The use of synonyms is important for clear communication and to avoid repetition in writing or speaking.