Re: I recommend
There is also the method where you each have access to a standard edition of a chosen book or books. Each word is described by its position on a page in the selected book. In that way even the same word can have a different descriptor each time it is used.
You never use pages near the end of the book - as that limit could indicate a selection criterion in code breaking.
Not quick to encode and decode - but impossible? to break by interception.