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The purpose of this study was to provide preliminary data on differences in lexical diversity and lexical-semantic errors in the language samples of children with developmental language disorder (DLD) and children with typical language development (TLD) of the same age.

We analyzed word use in the narrative transcripts of children with DLD and TLD (N = 14; M _age = 6;8 [years;months]) using standard measures of lexical diversity (number of different words, moving-average type–token ratio) and additional counts of lexical-semantic errors.

There were no significant differences between the groups in lexical diversity, and all children with DLD scored within the age-appropriate range on diversity relative to a normative sample. The children with DLD, however, produced significantly more lexical errors than their TLD peers.

The results suggest that caution is warranted when …