The one-liner to solve that SB is

  grep -v '[^victmze]' /usr/share/dict/words |
    grep .... | grep e

A program to generate all possible NYTM SB puzzles is at https://github.com/ncm/nytm-spelling-bee . The alterations to match the online version are trivial. It runs in well under 100 ms on a modern CPU.

There are bigger dictionaries packaged, e.g. wamerican-huge.