Dark hours
Nightfall and dark hours are semantically related. In some cases you can use "Nightfall" instead a noun phrase "Dark hours".
Nightfall
Nightfall noun - The time from when the sun begins to set to the onset of total darkness.
Dark hours and nightfall are semantically related. Sometimes you can use "Dark hours" instead a noun "Nightfall".
Mutual synonyms
Cite this Source
Nightfall and Dark hours. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/dark_hours/nightfall
Dark hours & Nightfall. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/dark_hours/nightfall>.
Nightfall or Dark hours. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/dark_hours/nightfall.
Google Ngram Viewer shows how "dark hours" and "nightfall" have occurred on timeline