Impact
Impact verb - To come into usually forceful contact with something.
Usage example: the damage sustained when a car going 40 miles an hour impacts with a brick wall
Knock is a synonym for impact in collision topic. In some cases you can use "Knock" instead the word "Impact" as a noun or a verb, when it comes to topics like action. popular alternative
Nearby Words: impacted, impacting, impactless
Knock
Knock verb - To come into usually forceful contact with something.
Usage example: my knee knocked against the table leg when I tried to get up quickly
Impact is a synonym for knock (North American) in collision topic. You can use "Impact" instead the word "Knock" as a noun or a verb, if it concerns topics such as bang. popular alternative
Mutual synonyms
How words are described
| high | high impact | high knock |
| similar | similar impact | similar knock |
| single | single impact | single knock |
| small | small impact | small knock |
| Other adjectives: strong, actual, hard, big, huge, little, greater, double. | ||
Common collocations
Both words in one sentence
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There's not enough mass or force to knock a person off their feet, but instead, it's the person's reaction to the impact that knocks them down.
Source: Blown Across the Room -
Vanessa, Ursula's disguise, has this when gloating about her inevitable victory (specifically, when she throws her hairpin at a mirror with enough force to knock the mirror back upon impact).
Source: Disney / The Little Mermaid -
He was struck with enough force to knock him into a pillar, which exploded and collapsed upon impact.
Cite this Source
Knock and Impact. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/impact/knock
Impact & Knock. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/impact/knock>.
Knock or Impact. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/impact/knock.
Google Ngram Viewer shows how "impact" and "knock" have occurred on timeline