Snoozer comes from snooze + -er. The verb snooze (late 18th century) is of unknown origin, perhaps imitative of quiet, drowsy breathing. Morphologically, snoozer is best read as compound, suffixal formation, imitative formation, and uncertain formation, yielding an English noun shaped by both form history and later usage. In current English it functions as a noun, with the sense "a person who dozes; informally, something tediously boring". related forms include snooze. The result is an English noun whose etymology preserves the older forms while supporting the word's specialized modern meaning.