Immediately
Immediately adverb - Without delay.
Overnight and immediately are semantically related. In some cases you can use "Overnight" instead an adverb "Immediately".
Overnight
Overnight adverb - During or for the length of one night.
Immediately and overnight are semantically related. Sometimes you can use "Immediately" instead an adverb "Overnight".
Both words in one sentence
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They practically defined the term "overnight success", so when the idea arose to make a film based on their success, it was almost immediately given the green light.
Source: Film / Spice World - It immediately was a great success, superceding the old soccer ball design almost overnight.
Source: Newer Than They Think -
Red Sky, Take Warning: Upon seeing the now-crimson skies after an overnight ship ride, Kid immediately knows his group had arrived at Cobra Island.
Cite this Source
Overnight and Immediately. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/immediately/overnight
Immediately & Overnight. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/immediately/overnight>.
Overnight or Immediately. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/immediately/overnight.
Google Ngram Viewer shows how "immediately" and "overnight" have occurred on timeline