Someone who rises (gets up) early in the morning.(noun)
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Use "early riser" in a sentence
"It was quite early; great Mr. Sun, who is such an early riser in summer time, had not been up very long; the birds were just beginning to chirp their "good-mornings" to each other; and as for the flowers, they were still asleep."
"One morning early ” for he was always an early riser ” he took a chill while painting a spray of wild roses before breakfast (the drawing now in the Oxford Schools)."