You’re not alone. Everything that you said is exactly what I’ve been struggling with for years. Words that we should know the answer too (such as our name, someone we know’s name or addresses) are the worst like you said because there is no way to avoid these words or quickly think of an alternative word with similar meaning. Living with a stutter really is the worst. I feel like I’m really just a shell of myself and it’s hard to be success in the workplace especially when I know my stuff I can’t express it and look like I’m uninformed because I’m getting stuck on words while speaking. The only thing I want in life is to freely speak without the fear of stuttering