research тоже. Но это сам процесс - а результат - это study. You do the research, you study something, and then you have a study about it and can publish an article in a scientific magazine.
Пример. There are many studies which show correlation between the number of questions asked by a user on the Duolingo forum and the progress the student makes. Those studies were conducted by the volunteer moderators of the Russian forum and were not sponsored by anyone. (Пример выдуманный, мы таких исследований не проводили :))