The word "deterrent" means something that discourages or prevents an action or behavior. There are several synonyms for this word which include dissuasion, obstruction, hindrance, prevention, discouragement, disincentive, and prohibition. These words have similar meanings and can be used interchangeably in writing or speech when referring to something that deters or prevents an action. For instance, a security system can act as a deterrent for burglars, making it more difficult for them to break into a home. Similarly, a penalty or fine can be a deterrent for breaking laws or regulations. Therefore, these synonyms for "deterrent" are useful for adding variety and precision to one's vocabulary.