All done, results are very promising! Examples are too long so here is one below, and this gist has more: https://gist.github.com/binarymax/6befa448df3f5fd6dba9

        Starting training using file 10m.txt
        Vocab size: 305432
        Words in train file: 565170189
        Alpha: 0.000045  Progress: 99.91%  Words/thread/sec: 107.57k  
        real   174m19.955s
        user   1315m35.661s
        sys    3m27.011s

Enter word or sentence (EXIT to break): startup

        Word: startup  Position in vocabulary: 390

                                                      Word       Cosine distance
        ------------------------------------------------------------------------
                                                  startups      0.808231
                                              bootstrapped      0.719379
                                              entrepreneur      0.707722
                                                    starup      0.698379
                                             bootstrapping      0.698216
                                                 incubator      0.683647
                                                  founders      0.664983
                                                   scrappy      0.660502
                                             entrepreneurs      0.660176
                                           entrepreneurial      0.656120
                                                        yc      0.652160
                                                 cofounder      0.651848
                                                        vc      0.650642
                                                 fledgling      0.636813
                                                cofounders      0.632761
                                                   venture      0.622636
                                                   company      0.617562
                                                incubators      0.612947
                                                    statup      0.608451
                                                   founder      0.608080
                                          entrepreneurship      0.604812
                                                        sv      0.603689
                                                     bigco      0.602171
                                               startuppers      0.592669
                                                 cofounded      0.588964
                                              entrepeneurs      0.585747
                                                      solo      0.582533
                                             entreprenuers      0.564045
                                               boostrapped      0.562884
                                              solopreneurs      0.559994
                                                cofounding      0.559840
                                                   statups      0.558347
                                                  business      0.552922
                                              bootstrapper      0.551885
                                                 techstars      0.545766
                                             bootstrappers      0.545263
                                                   fintech      0.545090
                                                  fundable      0.542542
                                                   shotput      0.541257
                                               accelerator      0.540787