This is the 9103rd most frequent Japanese word.
濁
"濁" means "muddy," "impure," or "cloudy" (often referring to liquids or sounds).
濁る (Nigoru) is used as a verb here, meaning 'to become cloudy or turbid.' It describes the state of the water in the pond being unclear.
池の水が濁っていて、生き物が見えない。
The pond's water is murky, and the creatures cannot be seen.
濁点 (Dakuten) refers to the diacritical marks in Japanese writing that transform voiceless consonants into their voiced counterparts, such as 'が' from 'か.'
濁点は日本語の発音を変化させる役割を持っています。
Dakuten have the role of altering the pronunciation in Japanese.
濁り (Nigori) is a noun derived from the verb '濁る,' indicating a state of cloudiness or roughness in quality, here referring to the character of the voice.