Try not to look up words when you are having a conversation
Don’t know the word for “pharmacy”? Say “place where you get medicine.”
Don’t remember the word for “refrigerator”? Say “that thing in the kitchen that is cold.”
Maybe you want to use a word that means “really, really, interesting” in your language, but you don’t know the word in English. Say “really, really interesting” instead. It’s okay for now – you can look up the better word (“fascinating”) later!
Keep the conversation going – it’s okay if you don’t have the perfect words!