YOU SAID:
my teacher is a deamon
INTO JAPANESE
私の先生はデーモンです
BACK INTO ENGLISH
My teacher is a demon
INTO JAPANESE
私の先生は悪魔です
BACK INTO ENGLISH
My teacher is a devil
INTO JAPANESE
私の先生は悪魔です
BACK INTO ENGLISH
My teacher is a devil
That didn't even make that much sense in English.