As nouns the difference between sunup and runup
is that sunup is the time of day when the sun appears above the eastern horizon while runup is an alternative spelling of lang=en.
sunup
English
Noun
(
en noun)
(US) The time of day when the sun appears above the eastern horizon.
(US) The change in color of the sky at sunup.
Synonyms
* (time of day): dawn, daybreak, sunrise
See also
* moonrise
* sparrow-fart
* sundown