The word 'Grudger' refers to someone who holds a grudge or feels resentful towards others. There are several synonyms that can be used to replace this word depending on the context and tone of the sentence. Some of the most common synonyms for 'Grudger' include 'resentful person', 'grudge-bearer', 'sorehead', 'malcontent', 'grouch', 'sulker', 'complainer', and 'begrudger'. Each of these words carries a slightly different meaning. For example, 'malcontent' suggests a person who is never satisfied while 'sulker' suggests someone who withdraws without expressing their feelings. Overall, these synonyms can be used interchangeably depending on the desired connotation.