[[A polar response word is a special morph that can be used as a polar response.]]
Such morphs are also called "response particles" (e.g. Krifka 2013) or "polarity particles" (e.g. Farkas & Roelofsen 2019). Since they are not particles (in the sense of "clitics that are not person forms or linkers"), it is better to call them "(polar) response words".