"Are silent" describes a state of quietness or absence of sound. Synonyms for this phrase include "are quiet," "are hushed," "are muted," "are noiseless," "are still," "are tranquil," and "are soundless." Each of these synonyms can differentiate slightly in the connotation that they convey. "Are quiet" can suggest a peaceful quietness, while "are hushed" can connote a reverent silence. "Are muted" is a more technical term that describes the reduction of sound, while "are noiseless" indicates a complete lack of sound. "Are still" can imply a lack of movement, and "are tranquil" conveys a serene and calming silence. "Are soundless" is the most straightforward synonym, indicating a complete absence of noise or sound.