IPA: //bɪˈheɪvjərɪst//
KK: /bɪˈheɪvjərɪst/
A person who studies the actions and reactions of people or animals, often focusing on how they respond to different situations.
The behaviourist observed the dog's reactions to various stimuli during the experiment.
Behaviourist → It is formed from "behaviour" (from Old French *comportement*, meaning conduct or manner of acting) and "-ist" (meaning one who practices or is concerned with). A behaviourist is someone who studies or practices behaviour, particularly in psychology.
Think of someone who is focused on 'conduct' or 'manner of acting' ('behaviour') and is an expert or practitioner ('-ist') in that area.
No commonly confused words.