The orthographic compounds (two or more words written as one word) in M. Rhode and B. Cronnell's lexicon of words used by elementary school children are categorized in this paper, primarily in terms of related semantic/syntactic structures. Following a discussion of orthographic compounds, the paper mentions procedures used by Rhode and Cronnell in specifying compound words used by children; it then outlines the procedures used in categorizing the more than 1,300 compounds in the Rhode and Cronnell lexicon. The first of two appendixes presents compounds divided into 15 categories on the basis of the relationship between the two parts of the compounds (subject/predicate, subject/verb, verb/object, verb/object of preposition, and so on). Within categories, the words are arranged by grade level. The second appendix lists words that do not fit into any of the categories used in the first appendix. (GT)