i'd say that delusions are somewhat distinct in defintion from paranoia since like you've said, when you're paranoid, you know that these thoughts aren't far from the usual, however, delusions accompanied with paranoia are completely different in my opinion. such delusional thoughts that could be far from the realm of reality are usually observed in individuals with schizotypal disorder. I for instance have also rational and irrational paranoid thoughts (magical thinking and such). I dont know if you also suffer from irrational paranoid thoughts.