デジタル大辞泉 gives the following definition of
[間投詞](http://dictionary.goo.ne.jp/leaf/jn2/49223/m0u/%E9%96%93%E6%8A%95%E8%A9%9E/):

> 《interjection》「感動詞」に同じ。

It also gives the following definition of
[感動詞](http://dictionary.goo.ne.jp/leaf/jn2/49224/m0u/) (emphasis added):

>
> 品詞の一。自立語で活用がなく、主語にも修飾語にもならず、他の文節とは比較的独立して用いられるもの。話し手の感動を表す「ああ」「おお」の類をはじめ、呼びかけを表す「おい」「もしもし」の類や、応答を表す「はい」「いいえ」の類も、文法的性質が同じなので、国文法ではこれに含まれる。
> **間投詞** 。感嘆詞。

Both terms are identically glossed as "interjection" in all the J-E
dictionaries I can find, and the definition for each in デジタル大辞泉 gives the
other as a synonym.

This is the only case I'm aware of where there are multiple ways of referring
to a part of speech (a la 動詞, 名詞, etc.), and so I cannot help but wonder if
there is some technical sense in which these two terms differ.
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words nuances parts-of-speech
In technical usage, is there any difference between 間投詞 and 感動詞?
Shogakukan gives much the same definition. However, I don't think that's
necessarily a big deal -- multiple terms of reference for a single part of
speech is not unknown in Japanese. 形容詞{けいようし}, for instance, have also been
called 形状言{けいじょうげん} and 様言葉{さまことば}. I suspect the difference between 感動詞 and
間投詞 might depend on which grammarian you ask. For what it's worth, the latter
appears to be more of a direct translation of the English term "interjection".
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From what I know, 感動詞 is the term more commonly found in Japanese language
textbooks and is the standard term used in discussions about the Japanese
language among linguists or translators. By contrast, 間投詞 is a synonym
typically glossed in dictionaries by referring to the entry on 感動詞.

Separately, the terms 形状言 and 様言葉 do not appear in any reference material I
have, including Kenkyushu'a J-E Dictionary, the Kojien or Meikyo J/J
dictionaries, or any of the typical J/E online dictionaries. As far as I know,
neither of these words exists in Japanese.
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