Is Veganism a subcategory of Vegetarianism?

[Blobbenstein]

If a vegan is a subcategory of vegetarian, and so a vegan is a type of vegetarian, then a vegan should be able to eat food where the label says, 'suitable for vegetarians'.

Does the category depend on what foods are included, or what foods are excluded?

 

[Poppy]

'Suitable for vegetarians' may include dairy or eggs, so not suitable for vegans.

It probably makes more sense to think of vegetarian as a subcategory of vegan (although I doubt this will catch on). Adding back foods (lacto, ovo, lacto-ovo) moves a step closer to omnivore.