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Morpho Home
These routines use PERL regexes (regular expressions) to chop words into pieces that have featured in language learning studies

  1. MorphoLex
    Affix Level x Frequency Profiler: BNC-Coca k-lists or texts (new) are sorted according to a model of affix development, in terms of how much particular affixes get used, how transparent their meanings are, how much change they impose on the base word, and how much they are likely to be known at different levels. This model is the basis of the family lists. Morpholex lets you track seven separate sets of affixes (or six of them together + summary profile) in 25 BNC-COCA k-lists or in your own list or text.

  2. 14 Master Words x Frequency
    An influential notion in some ESL circles has it that the components of just 14 words are re-used in as many as 14,000 further words. Thus, if learners really knew these 14 words... Test the coverage of these word parts in the broader lexicon.

  3. Lextutor's main English and French concordancers
    - include a family/lemma members list at the top+bottom of the output for family or starts-with search sorted keyword (example)

  4. English Vocabprofile include a TYPES:FAMILIES measure showing the number of different forms of words learners produce, which over time can track morphology development (developed for a study by Horst & Collins, 2006).