dayspring vs break of the day

dayspring and break of the day both are nouns.

Word	Noun	Adjective	Verb	Adverb
dayspring	Yes	No	No	No
break of the day	Yes	No	No	No

As nouns, dayspring and break of the day are synonyms defined as:

Other synonyms of dayspring include aurora, break of day, cockcrow, dawn, dawning, daybreak, first light, morning, sunrise, sunup.

dayspring (noun)	break of the day (noun)
the first light of day	the first light of day