sunup

is likely misspelled.

has no English definition.

As a noun sunup

is the time of day when the sun appears above the eastern horizon.

As nouns the difference between sunup and suncup

is that sunup is the time of day when the sun appears above the eastern horizon while suncup is the evening primrose.

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.

As nouns the difference between taxonomy and sunup

is that taxonomy is the science or the technique used to make a classification while sunup is (us) the time of day when the sun appears above the eastern horizon.