fieldwork

IPA: fˈiɫdwɝk

(uncountable, agriculture) Work done out in the fields as opposed to that done elsewhere on the farm (e.g., barn, house, outbuildings, office).
(uncountable) Work done out in the real world rather than in controlled conditions
(in scientific research) The collection of raw data in the field, field research, field study, field studies.
(countable, rare) A temporary fortification built by troops in the field; a defensive earthwork in the field.

field work

IPA: fˈiɫdwˈɝk

Not only are they mobile, meaning they could be used in group-settings or field-work.
One would supervise shipments and correspondence, while the other would conduct field-work among POWs.
Use of these potentially compromised officers in future espionage field-work would be risky and foolish.
I seriously doubt, however, that the South Africa field-work course is the only way to meet the particular requirement he has to meet.
Sometimes Bonnard acted as recorder for Bakkun when administration duties prevented Kai from field-work beside the heavy-world geologist.
Based on field-work between 1982 and 1987, Evans estimated that the total population for these endangered species reached levels as low as about 60 imperials and 200 red-necks.
These range from procuring advanced technology to integrate data-bases; to focusing our vetting and security-advising resources to sensitive posts in priority institutions; to establishing vetting field-work units in targeted departments.