Nouns

(n)winnow, winnowing, siftingthe act of separating grain from chaff“the winnowing was done by women”

Verbs

(v)winnowseparate the chaff from grain by using air currents“She stood there winnowing grain all day in the field”
(v)winnowblow on“The wind was winnowing her hair”, “the wind winnowed the grass”
(v)cull out, winnowselect desirable parts from a group or list“cull out the interesting letters from the poet's correspondence”, “winnow the finalists from the long list of applicants”
(v)winnow, fanblow away or off with a current of air“winnow chaff”, “The speaker ceased to be an amusing little gnat to be fanned away and was kicked off the forum”