I.
noun
Rap is used before these nouns: ↑ artist , ↑ lyrics , ↑ music , ↑ scene , ↑ sheet , ↑ song , ↑ star , ↑ video
II.
verb
ADVERB
▪ loudly , sharply
▪
He rapped sharply on the door.
▪ gently , lightly
PREPOSITION
▪ on , with
▪
He rapped on the window with his stick.