Hum
Hum noun - A monotonous sound like that of an insect in motion.
Usage example: we heard the hum of an outboard motor and a few minutes later the small craft came into sight
Thrum
Thrum noun - A monotonous sound like that of an insect in motion.
Usage example: the steady thrum of the turbines in the power plant
Mutual synonyms
Cite this Source
Thrum and Hum. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/hum/thrum
Hum & Thrum. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/hum/thrum>.
Thrum or Hum. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/hum/thrum.
Google Ngram Viewer shows how "hum" and "thrum" have occurred on timeline