The word "downrushes" means a sudden or rapid downward flow or rush of something. Synonyms for this word include "plunge," "plummet," "drop," "descend," "tumble," "fall," "swoop," and "dive." These words can be used interchangeably with "downrushes" depending on the context of the sentence. For example, "The plane took a steep downward dive" or "The boulder descended rapidly down the mountain." Whether describing a physical action or an emotional response, the use of synonyms can enhance the clarity and impact of a sentence.