noun
interrogative adverb
A grammatical term for adverbs that ask questions, such as いつ, どこ, なぜ, どう, どうして, and いかに.
「いつ」「どこ」「なぜ」などは疑問副詞と呼ばれる。
Words like いつ, どこ, and なぜ are called interrogative adverbs.
疑問詞 is the broader term for interrogative words (including pronouns, adverbs, etc.), while 疑問副詞 specifically refers to interrogative adverbs.
Compound of 疑問 (question) and 副詞 (adverb), a straightforward technical term.