Abstract
The Japanese language has a lot of functional expressions, each of which consists of more than one word and behaves like a single function word. A remarkable characteristic of Japanese functional expressions is that each functional expression has many different surface forms. This paper proposes a dictionary of Japanese functional expressions with hierarchical organization. We use a hierarchy with nine abstraction levels: the root node is a dummy node that governs all entries; a node in the first level is a headword in the dictionary; a leaf node corresponds to a surface form of a functional expression. We have compiled the dictionary with 341 headwords and 16, 771 surface forms, which covers almost all of surface forms for each headword.
