Repetitive words (e.g. どんどん, ぺらぺら, いらいら...) This is one area that sometimes dings me on tests. While I can generally figure out what is meant from context, I only know a handful offhand. The question here is twofold: * Is there a specific name for this category of words? * Are there any references that specialize in this vocabulary?

There are actually two types of words here. One is `[]{}` which are onomotopoeia: words representing sounds. Some examples of this are `` (dog barking), `` (scratching, crunching - like popsicles), and `` (sound of something rolling).

The other type is `[]{}` which "depict non-auditory senses". Your examples fall into this category.

Note that both categories contain many other examples that are not repeated, such as `` (stare, look intently) or `` (fall and thud).

As for references, check out our resources post on meta.