Espionage is a subfield of the broader intelligence field.
Notes on verification
Confirmed by Wikipedia's own definitional framing and corroborated by Britannica and EBSCO, which describe espionage as a narrower activity within the broader intelligence field. Minor definitional variance exists among casual sources but authoritative ones agree.
Sources
- Espionage (en.wikipedia.org)
- https://www.ebsco.com/research-starters/military-history-and-science/espionage-and-intelligence (ebsco.com)
- https://www.spymuseum.org/education-programs/spy-resources/espionage-facts/ (spymuseum.org)