The term "greenwing" may refer to a certain species of bird, namely the green-winged macaw. However, outside of this context, the word "greenwing" may have other potential synonyms. One synonym for "greenwing" is green-feathered, which describes the physical appearance of a bird with green feathers on its wings. Alternatively, one could use "emerald-winged," which captures the eye-catching, jewel-toned quality of the green feathers. Another option could be "verdant-winged," which emphasizes the lush greenery associated with the color green. Lastly, "chartreuse-winged" could be used to describe the yellow-green color associated with the green-winged macaw's feathers.