"Shammer" has multiple synonyms that can be used in different contexts. One of the most common synonyms is "hypocrite," which refers to someone who pretends to have certain beliefs or moral standards but does not act according to them. Another possible synonym is "faker," which describes someone who presents a false image or pretended behavior. Alternatively, "posuer" implies someone who puts on airs or claims to be something they are not. Another synonym is "charlatan," which describes someone who fraudulently asserts their abilities or knowledge. Finally, "imposter" is another similar word that refers to someone who pretends to be someone else, often for nefarious reasons.