There are several synonyms for the word "blackmails" that can be used in place of this term in writing or speaking. Firstly, the term "extorts" can be used to convey a similar meaning, as it refers to the act of using threats or force to obtain something from someone. Another option is the term "coerces," which describes using pressure or intimidation to induce someone to do something. Additionally, the term "intimidates" can be used to describe the act of using fear or threats to manipulate someone. Ultimately, using synonyms for "blackmails" can help to add variety and nuance to one's vocabulary, while still conveying a similar meaning.