thrum

(noun) a thrumming sound. Example: "He could hear the thrum of a banjo."

(verb) sound with a monotonous hum. Synonyms: hum.

(verb) sound the strings of (a string instrument). Synonyms: strum. Example: "Strum a guitar."

(verb) make a rhythmic sound. Synonyms: drum, beat. Examples: "Rain drummed against the windshield." "The drums beat all night."