zumbido – buzzing sound, humming sound
soom-BEE-doe; sustantivo masculino
El detective oyó un zumbido detrás de la puerta.
The detective heard a buzzing sound behind the door.
Some Spanish words seem more efficient than their English equivalents. Although in English, a noun “buzzing” may exist in some sense, it seems awkward to say “heard a buzzing” without adding the word “sound.” In Spanish usage, however, the noun “zumbido” stands alone.
Note: Although the word “detective” is spelled identically in Spanish and English, the Spanish-language version is pronounced quite differently: day-tayk-TEE-vay