Ethnology is a scholarly subject; the term is most common in academic and research settings. She lectured on ethnology at the university.
Pro Tip 2/3
Not Just History
Ethnologists study current cultures too, not just ancient or historical ones. The ethnologist is researching contemporary urban rituals.
Pro Tip 3/3
Field Research
Ethnologists often do fieldwork, meaning they gather information by visiting people and places. He's an ethnologist conducting fieldwork in the mountains.