Quality is delighting customers
you could post some screen shots of the product you want to write test cases about and a function list of the fuctions of this product
In that Word Search is one module. thr v hv the functionality called By Spelling, By Phonetics and By Spelled Pronunciation. Sorry I cant add the screen shots.
Its not an intrw question.
How do you write test cases for any other product???
Below link may help you.