Screamest is an archaic term that means "screamed the loudest" or "made the most noise." In modern English, there are several synonymous terms that can be used interchangeably with screamest, including shout, yell, holler, scream, bellow, and howl. Each of these words conveys a different degree of intensity and emotion. Shout and yell are typically used for a short burst of sound, while holler and scream suggest prolonged intensity. Bellow carries a connotation of deep, powerful shouting, and howl is often associated with an animalistic or eerie quality. Overall, whether you use screamest or one of its synonyms, the meaning will be clear: someone made a lot of noise.