Early hours
Nighttime and early hours are semantically related. In some cases you can use "Nighttime" instead a noun phrase "Early hours".
Nighttime
Nighttime noun - The time from sunset to sunrise when there is no visible sunlight.
Early hours and nighttime are semantically related. You can use "Early hours" instead a noun "Nighttime".
Mutual synonyms
Cite this Source
Nighttime and Early hours. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/early_hours/nighttime
Early hours & Nighttime. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/early_hours/nighttime>.
Nighttime or Early hours. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/early_hours/nighttime.
Google Ngram Viewer shows how "early hours" and "nighttime" have occurred on timeline