I forgot, we also used word2vec to build an embedding space based on PubMed abstracts. We found lots of variant spellings (including hyphenated, unhyphenated,

I forgot, we also used word2vec to build an embedding space based on PubMed abstracts. We found lots of variant spellings (including hyphenated, unhyphenated, and space-separated), acronyms and abbreviations for chemical and biochem names. We could probably have built a lexicon of technical terminology from that. Not sure how far we would have gotten with definitions (vectors don't quite work...), but it would be a start. Pretty sure others have done dictionary building using that mechanism too.