• 歌詞かし — song lyrics
• 台詞せりふ — lines / dialogue
• 動詞どうし — verb
• 名詞めいし — noun
• 副詞ふくし — adverb
• 形容詞けいようし — adjective

詞 combines 言 (speech / language) with 司 (to govern or control). It originally referred to words that “govern” or organize expression, and today it appears in grammatical terms and poetic contexts.