Zoology is comprised of numerous categories, known as sub-disciplines. For instance, primatology is the study of primates, entomology is the study of insects, ichthyology is the study of fish and ornithology is the study of birds.
A public accountant works for a public accounting firm that performs auditing, tax, consulting and accounting services for other businesses, organizations or individuals.
A general description of what a public administrator does is to develop policy and then implement and oversee those policies with the goal of improving the public agencies and the services offered. But that broad description does not adequately cover all public administrators.