The word "knowall" is generally used to describe someone who is boastful about their knowledge, often to the point of annoyance. There are several synonyms for this word that can be used to describe someone who exhibits this behavior. These synonyms include "wiseacre," "smart aleck," "know-it-all," "smarty-pants," "brainiac," "intellectual," "savant," and "genius." Each of these words describes someone who is knowledgeable, but may also exhibit an attitude of arrogance or superiority due to their expertise. While these words can be used to describe someone with an impressive intellect, they also carry negative connotations due to the individual's demeanor and behavior.