The term 'knocks hard' can be summarized by two crossword solutions: 'raps' (4 letters) and 'condemns' (8 letters). Raps is a type of rhythmic music that is usually spoken or chanted, often with a strong beat. It is commonly associated with hip-hop culture and is often used to express social and political messages. Condemns is an expression of strong disapproval or criticism. It is often used to describe a situation in which someone or something is judged to be wrong or immoral. Both words can be used to describe the idea of knocking hard, as they both imply a strong and forceful action.