Age-of-acquisition, imagery, concreteness, familiarity, and ambiguity measures for 1,944 words of varying length and frequency of occurrence are presented. The words can all be used as nouns. Intergroup reliabilities are satisfactory on all attributes. Correlations with pre-vious word lists are significant, and the intercorrelations between measures match previous findings. METHOD Table 1 Distribution of Words by Length and Frequency in the Sample of 1,944 Drawn From Thorndike-Lorge (1944) many alternative meanings are unknown or of low salience to most subjects. However, words may be expected to vary in their degree of effective ambiguity, and it is this that we set out to measure. L;;.9 Word Length (L) L.;;5 Thorndike-Lorge Frequency Word Sample A total of 1,944 words were selected from the Thorndike-Lorge (1944) word count by means of a semirandom procedure, in such a way as to fill the cells of a 3 by 3 matrix of word length and frequency (Table I). The overall strategy was to select every 10th word that could be used as a noun. If this was not suitable, the first appropriate word within that group of 10 was selected. It was decided that, for research purposes, a fairly even distribution of words over length by frequency combinations was desirable. Due to the underrepresentation of infrequent short words and frequent long words, the latter were selected in preference to other frequency by length combina-tions to give a more even distribution. The numbers of words selected in each cell aregiven in Table I. Ratings Procedure F or the age-of-acquisition, imagery, concreteness, and famil-iarity ratings, the following procedure was used. The words were printed, in random order, 20 to a page, and alongside each word was a 7-point rating scale. The pages were then shuffled and assembled into booklets, so that each booklet contained the pages in a different random order. Due to the large number of pages, the booklets were divided into three sections, each containing approximately 33{\%} of the words. The three