"Piaf" is a French word that translates to "sparrow" in English. When referring to the famous French singer Edith Piaf, synonyms for "piaf" can include "chanteuse," which is another French word for a female singer, or "songbird." Other synonyms for "piaf" could include "chirper," "warbler," or "songster." These words all relate to singing, which was a significant part of Edith Piaf's legacy and career. However, it should be noted that "piaf" is most commonly used as a direct reference to Edith Piaf herself, rather than as a general term for a singer or songbird.