Meaning ‘discourse about’ or ‘study of‘. Usually preceded by the connective ‘o’.

aetiology (US etiology)

anthology

apology

archaeology (US archeology)

astrology

astronomy

audiology

biology

cardiology

chronology

climatology

cosmetology

cosmology

criminology

cytology

dermatology

ecology

embryology

ethnology

etiology

etymology

geology

gerontology

gynaecology (US gynecology)

haematology (US hematology)

histology

horology

hydrology

ideology

immunology

kinesiology

laryngology

meteorology

methodology

morphology

musicology

mythology

nephrology

neurology

numerology

oncology

ontology

pathology

phonology

phraseology

phrenology

physiology

primatology

proctology

psephology

psychology

radiology

seismology

sociology

tautology

technology

theology

topology

toxicology

typology

virology

vulcanology

zoology

Also related to the bound base ‘logue’/’log as in ‘analogue’ and ‘analogous’