The word "brood" refers to a group of young birds hatched from the same clutch of eggs or the action of sitting on eggs to incubate them. However, "brood" can also have a figurative meaning, such as dwelling on negative thoughts or worrying too much. Synonyms for the word "brood" in this context include ruminate, ponder, mull, fret, and obsess. These words all convey the idea of giving too much attention to negative or unpleasant thoughts. On the other hand, synonyms for the word "brood" in the bird sense include clutch, breed, spawn, and nest. These words all relate to the idea of hatching or nurturing young birds.