Ology comes from the greek logos, meaning "the study of" something.
There are an incredible amount of different branches of science,
thus there are a lot of ologies.
This list is designed to define as many as possible.
Note:
Many of these ologies start with the prefix paleo,
it is greek for old or ancient.
Ology: The study of...
anthropology-- humans
apiology -- bees
archaeology -- past culture of humans
astrology -- stars (for making predictions)
bacteriology -- bacteria
biology -- life
cartology -- maps and map-making
cetology -- whales
climatolgy -- climate
conchology -- shells
cosmetology -- cosmetics
cosmology -- universe
criminology -- crime and criminals
cryptology -- codes
ecology -- interactions in environments
entomology -- insects
embryology -- embryos
eschatology -- death,judgement, afterlife
ethnobiology -- life pertaining to certain people
ethnology -- cultural heritage
ethology -- animal behavior
etiology -- causes and reasons
etymology -- a word
geology -- earth
graphology -- handwriting
herpetology -- reptiles
hippology -- horses
hydrology -- water
ichthyology -- fish
ideology -- ideas
mammalogy -- mammals
meteorology -- climate and weather
microbiology -- microscopic life
morphology -- structure of organisms
musicology -- music
mycology -- fungi
myrmecology -- ants
nephology -- clouds
neurology -- brain
ornithology -- birds
ophiology -- snakes
ophthalmology -- eyes
otology -- ears
paleoanthropology -- ancient human-like creatures
paleobiology -- ancient life
paleontology -- ancient life, studied through fossils
paleozoology -- ancient animals
pathology -- disease
pedology -- children
petrology -- rocks
phantomology -- supernatural beings
pharmacology -- drugs
pharyngology -- pharynx (part of throat)
phenology -- periodic biological phenomena
phenomenology -- phenomenons
philology -- historical language
phonology -- speech sounds
phraseology -- use of words and phrases
physical anthropology -- human characteristics
physiology -- characteristics of organisms
phytology -- plants (usually called botany)
phytosociology -- relationships and charactistics of plants
pomology -- fruit
psychology -- mind and behavior
pyrology -- fire
seismology -- earthquakes
sociology -- society
somatology -- human characteristics
speleology -- caves
storiology -- stories and legends
topology -- characteristics and history of a place
tropical biology -- tropical life
vulcanology -- volcanoes
zoology -- animals