Anserous is the adjective form of "goose," which refers to something resembling or related to a goose. However, there are a number of synonyms that can be used to express the concept of "anserous" depending on the context in which it is being used. Some potential synonyms might include avian, fowl-like, feathered, beaky, or bird-like. Other possible terms might include "geese-like," "avian-inspired," or "goose-associated." Ultimately, the choice of synonym will depend on the specific context in which one is writing, as well as the stylistic choices being made.