Break of day and Early bright

Break of day noun - The first light of day.

Early bright and break of day are semantically related In some cases you can use "Early bright" instead a noun phrase "Break of day".

Break of day and early bright are semantically related in dawn topic. You can use "Break of day" instead a noun phrase "Early bright", if it concerns topics such as beginning of day, rise of sun above horizon, beginning of light hours, first part of the day.