researcher

research association; research society / group of enthusiasts (as may be found in schools, colleges, etc)

research & development; R&D

(education) research project, done by Japanese schoolchildren during summer break, to be presented upon return to school

corner (e.g., of a room or board surface); nook

anyhow, anyway, in any case / ([…]は兎も角) setting aside

anyhow, at any rate, anyway, somehow or other, in any case

(idiomatic) to self-reflect, to give a serious thought

(phonetics) nucleus

Kyūjitai form of 主権 (“sovereignty”)