The word "crow nests" refers to the place where crows build and inhabit their nests. Antonyms for "crow nests" would be places where crows do not build their nests or places where there are alternative bird nests. For instance, a birdhouse or a nest box made for other bird species would be an antonym for "crow nests." Other antonyms could include "open fields," "treeless areas," "urban landscapes," "desert terrain," or "water bodies" where crows may not thrive. In general, any location that does not support the nesting habits of crows could be used as an antonym for "crow nests.