the word sweetener is a modern english formation built upon the old english adjective swēte, which descends from the proto-germanic swōtuz, itself derived from the proto-indo-european root swéh₂dus, meaning pleasant or sweet. the germanic verbal suffix en was attached to create the verb sweeten, meaning to make sweet. subsequently, the agent suffix er was added to form the noun sweetener, literally denoting a thing that makes something sweet. this transparent compounding process illustrates how english mechanically constructs new terms for concrete substances and, by metaphorical extension, for abstract inducements.

Structure: sweet (sweet) + en (make) + er (agent/thing) sweet: from old english swēte, meaning pleasant to the taste, not salty or bitter. functions as the core adjective root. en: a verb-forming suffix of germanic origin, meaning to make or become. functions as a derivational suffix creating a verb. er: an agent noun suffix of germanic origin, meaning a person or thing that performs an action. functions as a derivational suffix creating a noun.