Antonyms for the word "archaisms" could include modernism, innovation or novelty. These are words that represent ideas or objects that are current or new, and generally not outdated or old-fashioned. The opposite of an archaism is something that is contemporary or fresh, and reflects the newest trends or technology. While archaisms might have value in certain contexts, such as historical writing or literature, they might be considered irrelevant, redundant, or even archaic in modern discourse. Thus, antonyms for "archaisms" signal our desire to stay current with the times and embrace progress and change.