Obtests commonly refers to a verbal expression of strong disapproval or protest. There are several synonyms that can be used interchangeably with this word. Some of these include "protests," "opposes," "objects," "resists," "rebukes," "denounces," "condemns," "deprecates," and "disapproves." Each of these synonyms carries a slightly different connotation, but they all share the idea of expressing opposition or objection to something. It's important to note that when using synonyms, context is key. The appropriate synonym will depend on the situation and tone of the overall message being expressed.