Giving Suggestions to the errors

1

How you are giving correct suggestion to a word?
Like book - NN ----------------> books - NNS
How you finding the NNS of the word “book”(NN) is “books”?
Please let me know what is the corresponding java file that giving suggestions?

2

Please see org.languagetool.synthesis.en.EnglishSynthesizer

3

Thank you.

4

And please let me know, in which java file you are generating the final json object to return.