When you get a Canadian visa it has a "category" printed on it. For most short term visitors to Canada the category will be either "V-1 Visitor" or "B-1 Business Visitor".
Legally speaking these two categories are identical, and are just labels on the Temporary Resident Visa. The only difference is the reason you stated on your application for your initial visit. In fact most official Canadian documentation doesn't refer to the B-1 or V-1 categories at all, they just talk about the Temporary Resident Visa. You use the same application form for both business and tourism, and the link specifically says "there is no separate application for business visitors". If you want to know what you can do with such a visa, look up the terms for the Temporary Resident Visa.
TRVs come in two types - single entry and multiple entry. If it was multiple entry, and it is still valid, then you can return to Canada as often as you like for either business or tourism purposes. There are limits on how long you can stay, and you can't work in Canada, but the visa is legal for both business and tourist purposes.
This appears to give the category codes, but I can't vouch for its accuracy.