What to rely on a editor?

by Joel
(Philippines)

Suppose I have my idea for my story on a novel but have trouble making the story sound good or at least un-mediocre how could a editor help me on that? For example my words my vocabulary is pretty limited and so I sometimes have problems discussing the features of a person or describing stuff because of the lack of depth I in my words.

I really do think I have a great story it's just my choice of words to use are kind of bland in comparison to other novel's I've read.

Can I rely on an editor to change around my sentences and words add some new words that would sound so captivating to a reader while preserving the original story? Or do I just rely on them to make the necessary grammar/spelling mistakes without caring if the story telling is bland. Thanks.