IPA: //bɪˈheɪvjərɪst//
KK: /bɪˈheɪvjərɪst/
A person who studies or specializes in the behavior of humans or animals, often focusing on how they act in different situations.
The behaviorist observed the dog's reactions to various stimuli during the experiment.
Behaviorist → It is formed from "behavior" (from Middle English *beheior*, meaning manner of conducting oneself) and "-ist" (meaning one who practices or is concerned with). A behaviorist is someone who studies or practices behavior, particularly in psychology.
Think of someone who studies how people conduct themselves — that's what a behaviorist does.
No commonly confused words.