[Rails] Cities spell checker

I'm totally lost with this feature so I wanted to ask to the community
for some links in order to implement this feature

I'm trying to make a city spell checker (actually a spell checker that
will work for anything at all that I have in the database)

So I.e. if I have in my database these two cities:

hollywood
bollywood

and the user writes and submit:

collywood

I want to show him something like?

Did you wanted to say any of these?

hollywood
bollywood

Can anyone point me in the right direction?

Thank you
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