The Biblical book of Ecclesiastes (Qoheleth) makes use of two complementizers: Se, which predominates in later stages of Hebrew, and 'aSer, which predominates in earlier stages of the language. I was interested in whether their differential use in this book had a grammatical basis. I found evidence for the view that 'aSer, presumably derived from a noun meaning "place", retained the grammatical features of a noun, features that Se lacked. The ramifications of this featural difference show up when the complementizers are used in object clauses, headed and free relatives. Some cross-linguistic evidence supports the proposal.