get across vs dawn

get across is not a noun while dawn is a noun.

Word	Noun	Adjective	Verb	Adverb
get across	No	No	Yes	No
dawn	Yes	No	Yes	No

As verbs, get across and dawn are synonyms defined as:

get across and dawn: become clear or enter one's consciousness or emotions

Other synonyms of get across include click, come home, fall into place, get through, penetrate, sink in.

get across (verb)	dawn (verb)
become clear or enter one's consciousness or emotions	become light
communicate successfully	become clear or enter one's consciousness or emotions
travel across or pass over	appear or develop