"Tomes" is a term generally used to describe large, weighty books, especially those that contain a great deal of information or are considered important literary works. Synonyms for "tomes" include "volumes," "opuses," "works," "literature," "texts," "manuscripts," "treatises," "folios," "compendiums," and "encyclopedias." These words all carry with them the notion of substantiality and depth of knowledge contained within. Whether referring to academic research, historical accounts, or classic literature, the use of these synonyms can help lend a sense of gravitas and importance to the subject matter being discussed.