The word "excrementary" refers to anything related to feces or waste matter. However, if you are looking for synonyms for this term, there are several options to choose from. One possible alternative is "feculent," which means dirty or contaminated with feces. Another option is "coprolitic," which describes something that contains excrement or has fossilized excrement within it. Additionally, the term "manurial" can be used to describe something that is related to the use of feces as a fertilizer. Finally, the word "scatological" refers to anything that pertains to excrement or bodily functions more broadly.