die Forschungsarbeit
research work
The activity of conducting scientific research on a particular topic or in a field of study.
Die Forschungsarbeit an diesem Medikament dauerte mehrere Jahre.
The research work on this medication took several years.

research work / research paper
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research work
The activity of conducting scientific research on a particular topic or in a field of study.
Die Forschungsarbeit an diesem Medikament dauerte mehrere Jahre.
The research work on this medication took several years.

This noun is made up of 'Forschung' (research) and 'Arbeit' (work), connected by the linking '-s'. So it literally means 'work that consists of research' or 'a work that documents research'.
Gute Forschungsarbeit ist die Grundlage für wissenschaftlichen Fortschritt.
Good research work is the basis for scientific progress.
You can tell whether the activity (process) or the document is meant by the verb. Verbs like 'dauern' (to take/last) or 'leisten' (to perform/do) refer to the activity. Verbs like 'schreiben' (to write), 'einreichen' (to submit), or 'lesen' (to read) refer to the written work.
Die Forschungsarbeit an dem Impfstoff dauerte mehrere Jahre.
The research work on the vaccine took several years.
The word 'Forschungsarbeit' is typical of academic and scientific contexts. It is used at universities, in institutes, and in specialist publications.
Ihre Forschungsarbeit wurde in einer renommierten Fachzeitschrift publiziert.
Her research paper was published in a renowned specialist journal.
When the written document is meant, the word is often combined with verbs that describe the life cycle of a scientific text: 'eine Forschungsarbeit schreiben' (to write a research paper), 'betreuen' (to supervise), 'einreichen' (to submit), 'verteidigen' (to defend), and 'veröffentlichen' (to publish).
Professor Müller betreut meine Forschungsarbeit zum Thema Klimawandel.
Professor Müller is supervising my research paper on climate change.
study
'die Studie' and 'die Forschungsarbeit' both belong to the academic or scientific field. 'die Studie' usually means a specific investigation into a particular question, often with data, a method, and results. 'die Forschungsarbeit' can mean the activity of doing research, that is, work carried out over a longer period of time. But it can also be a written text that describes an investigation. That is why the words are sometimes close in meaning. A study is more likely to be the research project or its results; a 'Forschungsarbeit' is more likely to be the process or the written academic text.

Hast du die Forschungsarbeit über sauberes Wasser schon abgegeben?
Have you already submitted the research paper on clean water?
In der Bibliothek lesen wir eine Studie über neue Technik im Unterricht.
In the library, we are reading a study about new technology in the classroom.