Dictionary and MSDict Concise Oxford Thesaurus

Hello all,

Recently posted in software reviews was an article about MSDict Concise Oxford Thesaurus.

From this stems a question:
I have noticed that the spell check that comes with the BOLD is somewhat at an infantile, kindergarten level. Certain words such as the email I was typing this morning, contained Langoustines (which did not appear in the spell check) and as for Gastronomy (it appeared as "G Astronomy).

Is there software or some program that will increase the vocabulary of my BBB? or is this MSDict Concise Oxford Thesaurus, the program I need?

Any other users can help shed some light on this topic??

Much appreciated,