I think you should forget about your parallel loop implement the things right.
Are you aware of the fact that this code loads and constructs the dictionary:
using (var hunspell = new Hunspell(enAff, enDic))
{
correct = hunspell.Spell(inputword);
}
Your are loading and construction the dictionary over and over again with your code. This is awfully slow! Load Your dictionary once and check all words, then dispose it. And don't do this in parallel because Hunspell objects are not thread safe.
Pseodocode:
Hunspell hunspell = null;
try
{
hunspell = new Hunspell(enAff, enDic)
for( ... )
{
hunspell.Spell(inputword[i]);
}
}
}
finally
{
if( hunspell != null ) hunspell.Dispose();
}
If you need to check words massive in parallel consider to read this article: http://www.codeproject.com/Articles/43769/Spell-Check-Hyphenation-and-Thesaurus-for-NET-with