Rules for replacing words

I have a requirement where i need to replace certain words with a single word. I found that we can do this using Rules (by using the consequence ‘Replace word’. I am creating the rule using manual option since Replace word is available only there.
The questions I have are :

  1. Is there a limit on the number of rules that can be created for replacing a word?
  2. Is there a way where we can upload all these rules in a file to Algolia rather than having to create each rule? (Since i have hundreds of such words which have to be replaced)

Any input on this will be really appreciated.
Thanks in advance.