How to define custom synonyms for words or sentences in yml file, any help would be appreciated.

[mayanklahoti]

For example, if I want the same answer (output) for eNodeB, eNB and evolved node B all 3 inputs.

.yml file:

The above code is not working it's just for example!

[vkosuri]

You might try preprocessor https://chatterbot.readthedocs.io/en/stable/preprocessors.html