O is for Ology

Anemology - wind
Bryology - mosses
Cryptology - codes and ciphers
Dactylology - fingerprints
Etymology - word origins
Futurology - the future
Glottochronology - history of language
Hematology - blood
Ichthyology - fish
Japanology - Japan
Kinesiology - human movement
Lexicology - vocabulary
Metrology - measurement
Nomology - law making
Odontology - teeth
Pathology - diseases
Quinology - the cinchona
Rhinology - noses
Selenology - moon
Trichology - hair
Ufology - unidentified flying objects
Vexillology - flags
Wetland hydrology - soil saturation
Xylology - wood
Yourdon methodology - generic term for specific software engineering
Zymology - fermentation