"thrums" in the noun sense
a thrumming sound
"he could hear the thrum of a banjo"
"thrums" in the verb sense
1. hum, thrum
sound with a monotonous hum
2. strum, thrum
sound the strings of (a stringed instrument
"strum a guitar"
3. drum, beat, thrum
make a rhythmic sound
"Rain drummed against the windshield"
"The drums beat all night"
Source: WordNet® (An amazing lexical database of English)
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