Okay this will help you out a little, with any Japanese words, I may use in my Fanfic.
{Hai} Hai means Yes, or Yeah or in some fanfics Sure, it's the way it's used in a sentence.
{Gomen Nasi} Gomen Nasi basiclly mean "I'm Sorry", Gomen by it's self means "Sorry".
(Nani) Nani means "What?" as in a question.
(Baka) Baka can mean a few things.... What it basicly means is "Fool", or "Idiot" it depends how it's used in a sectence.. some times, it can mean "Stupid".
(Nooto) Nooto, means Notebook.
(Hanashi) Hanashi means Story.
(Sakana) Sakana means Fish.
(Yasai) Yasai, means Vegetable. (Vegeta is not a japanese word)
(Mono) Mono means "Thing" or "Object"...... it depends how you use it a sentence.