Yamato kotoba
Nouns based on adjectives end with the syllable さ (-sa), as in hayasa (kanji and hiragana: 速さ, hiragana only: はやさ, meaning: speed), takasa (kanji and hiragana: 高さ, hiragana only: たかさ, meaning: height), and ookisa (kanji and hiragana: 大きさ, hiragana only: おおきさ, meaning: size/largeness).