There is no need to try all these words.
Electrum uses specific words for generating the seed phrase.
The list includes 2048 words and only 11 of them (mentioned by BlackHatCoiner in the first reply) start with "sw".
This case is very easy to do manually. OP very lucky to forgot only part of one word.
Forget one word but know its place, still quite easy. Anything after that starts getting complicated and time consuming.