What is the difference

[Christin93]

We can both use these words, but What is the difference? capital worlds are the ones I think are right

The grey wolfs play a vital PART/role in the health of ecosystem.

Thanks in advance!

[freezeframe]

We can both use both of these words. But what is the difference? Capitalized worlds are the ones I think are right

The grey wolfsves play a vital PART/role in the health of an ecosystem.

Thanks in advance!

They mean the same thing.