When you have found the word you are interested in, the search button retrieves all the documents that contain that word in their database entries. Query A query is very open ended. The query can look everywhere for any example of the word you have entered and immediately present a list of documents containing the word. All the words used to describe every text and all words in all texts can be searched through. Combinations of fields and search terms can be built up to construct very sophisticated queries.
Special care needs to be taken when using the Subject field.
Additional help will be available soon.