research [uncountable] also researches formal (Longman)
1 serious study of a subject, in order to discover new facts or test new ideas
research into the causes of cancer
scientific/medical/historical etc research
a research team
I'm still doing research for my thesis.
Gould was helped in his researches by local naturalists.
2 the activity of finding information about something that you are interested in or need to know about:
It's a good idea to do some research before you buy a house.
researches plural noun (Cambridge)
His researches (= research) in the field of disease prevention produced unexpected results.
Student or Learner