To readers of "Jazzing up your Japanese with onomatopeia"

Japanese Language Resources
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Hi folks,

Each onomatopeia entry in this book is followed by symbols such as B or N or N/B … I looked for some explanation in the introduction but could not find one. I’m guessing that N might stand for “noun” ? Many thanks in advance if you can tell me what they mean.

If you have not ever heard about this book, I enthusiastically recommend it: it has lots of vocabulary that we don’t see at Wanikani, and there are some practices exercises.

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It’s hidden in the preface, on the bottom of page 6:

Each of the main vocabulary items is marked G, N, or B (Good, Neutral, or Bad, to show if its sense is positive, neutral, or negative).

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