The terms "sociopath" and "psychopath" are interchangeable.
Word family
WORD FAMILYadjectivechangeableinterchangeablechanged ≠ unchangedchanging ≠ unchangingchangelessnounchangeinterchangeinterchangeabilityverbchangeinterchangeadverbinterchangeably
things that are interchangeable can be used instead of each other: These two words are almost interchangeable. a camera with interchangeable lenses—interchangeably adverb—interchangeability /ˌɪntətʃeɪndʒəˈbɪləti $ -tər-/ noun [uncountable]