Grousers can be defined as people who habitually complain or grumble. If you are looking for synonyms for this word, then there are a few excellent options that you can consider. One great word to use as an alternative is "whiners." Other good options include "grumblers," "faultfinders," "carpers," "naysayers," and "moaners." These words all convey the same sense of habitually complaining, and they can be useful to vary the word choice in your writing. One of the benefits of using synonyms for words like grousers is that it helps to avoid repetition, adding depth and variety to your language.