Tips for not mixing up similar words?

Hey everyone! I'm finally geting into more vocab but man, I keep mixing up words that sound or look almost identical. It's so frustrating when I'm trying to talk and I just freeze up because two words feel the same in my head. Does anyone have any cool hacks for this? I've tried mnemonics but they are getting a bit messy. Maybe there's a better way to group them or something? I'd love to hear what you guys do to stay