朵儿 is a colloquial, affectionate noun for 'flower', formed by adding the diminutive suffix 儿 (-r) to 朵 (a classifier for flowers). It's used in northern Mandarin dialects (especially Beijing) to refer to flowers in a casual, endearing way — like saying 'little flower' or 'blossom'. Unlike the standard word 花 (huā), 朵儿 is less formal and more regional.