Fast
Fast adjective - Moving, proceeding, or acting with great speed.
Usage example: the fast pace of construction resulted in our new house being done ahead of schedule
High-speed is a synonym for fast in fast-moving topic. In some cases you can use "High-speed" instead an adjective "Fast".
High-speed
High-speed adjective - Operating at high speed.
Usage example: a high-speed food processor
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Synonyms for High-speed
Fast is a synonym for high-speed in direct topic. You can use "Fast" instead an adjective phrase "High-speed".
Mutual synonyms
Both words in one sentence
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Super Speed — Sunred can run as fast as a high-speed train; the anime actually spoofs this by making hin run alongside a high-speed train in one OP.
Source: Manga / Tentai Senshi Sunred -
This is called Edgerton's Syndrome, after the guy who took high-speed pictures of fast-moving objects, freezing the images forever in time.
Source: Not Growing Up Sucks - Whenever fighting a ''really'' dangerous opponent that goes too fast for his high-speed dodging skills, SC uses it to Flash Step.
Source: Fan Fic / Game Over
Cite this Source
High-speed and Fast. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/fast/high-speed
Fast & High-speed. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/fast/high-speed>.
High-speed or Fast. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/fast/high-speed.
