I think you can write below synonyms snippet to your nlu.md file
Suppose you get entities like “fly”, “go on air” etc when users intention is to go by plane then you can add
synonym:plane
- fly
- go on air
- aeroplane
- chopper
- flying
- above the ground
- flight
synonym:bicycle
- bike ride
- two wheeler
- scooty
- scooter
- sports bike
- cylce
then in your training messages add formatted messages as shown
below
intent:plane
intent:bicycle
- I want to take a bike ride
- I love to travel on two wheeler
- I choose to go on sports bike
Note: I assume you know how to tag entity to word
[word] (entity name) don’t add space here between [word] and (entity name)
then train your rasa and test I hope it gonna work.