-ology means study of
anthropology (n) - the study of humans
biology (n) - the study of life and living things
cardiology (n) - the study of the heart
dermatology (n) - the study of the skin
ecology (n) - the study of the environment
geology (n) - the study of the physical nature, structure, and history of the earth
graphology (n) - the study of handwriting and how it relates to a person's character
psychology (n) - the study of the mind
sociology (n) - the study of how people interact
zoology (n) - the study of animals