The word "militant" commonly refers to someone who is aggressive or combative in their beliefs or actions. Some synonyms for "militant" that convey similar meanings include "radical", "extremist", and "fanatical". Other words with this connotation include "zealous", "assertive", and "advocate". However, it's important to note that while these words may have similar meanings, they also carry different connotations. For instance, "zealous" or "assertive" can be used to describe someone who is enthusiastic about advocating for their beliefs, whereas "fanatical" or "extremist" have more negative connotations of going to dangerous or violent extremes to assert one's beliefs.