The advantage of the string transformation-based construction of DERIVBASE is its ability to include infrequent lemmas in the lexicon, and in fact DERIVBASE includes more than 250,000 content lemmas, some of which occur not more than three times in SDeWaC.
this is a potential problem when we build distributional representations for all lemmas in DERIVBASE since it is known from the literature that similarity predictions for infrequent lemmas are often unreliable (Bullinaria and Levy, 2007).