What's the noun for hamsters? Here's the word you're looking for.
hamster
Any of various Old-World rodent species belonging to the subfamily Cricetinae.
especially, the golden hamster, Mesocricetus auratus, and the dwarf hamsters of genus Phodopus, often kept as a pets and used in scientific research.
Other rodents of similar appearance, such as the maned hamster or crested hamster, Lophiomys imhausi, mouse-like hamsters of genus Calomyscus, and the white-tailed rat (Mystromys albicaudatus).