The word "interlocutrice" can be a tricky one to find synonyms for, as it is a somewhat uncommon term. However, there are a few options that could be suitable, depending on the context. One possible synonym could be "speaker," as this term is used to describe someone who is involved in a conversation or discourse. Another option might be "participant," which could be a good choice if the focus is on someone who is actively engaging in dialogue. Other potential synonyms for "interlocutrice" could include "dialogue partner," "conversationalist," or "interlocutor" (the masculine form of the word). Ultimately, the choice of synonym will depend on the specific situation and the intended meaning.