The term "by-words" refers to phrases or sayings that are commonly used to describe someone or something. For example, the phrase "a picture is worth a thousand words" is a by-word used to describe the power of visual imagery. Antonyms for by-words are words that are not commonly used or well-known phrases. These words may be obscure or obsolete, and may not carry the same weight or meaning as a well-known by-word. Examples of antonyms for by-words include unfamiliar, unremarkable, unknown, and insignificant. By choosing to use these types of words instead of by-words, writers can add uniqueness and originality to their writing.