The crossword solution for the term 'Small Green Bird' is Vireo, a five-letter word. Vireo is a genus of small passerine birds in the family Vireonidae. They are found in North and South America, and some species are migratory. Vireos are typically greenish in color, with some species having yellow or white markings. They have short, stout bills and short legs. Vireos feed mainly on insects, but also eat berries and other fruits.