What is a WordSquare?
This is a block of characters that spell words both horizontally and vertically.
The empty grid is a challenging word puzzle for the most discerning logophile.
The simplest puzzle is the two square consisting of only four letters, increasing in size and complexity to the pinnacle of achievment so far: the Ten Square. 

The Ten Square
One order 10 Wordsquare is the well-known creation of the late Dmitri Borgmann.  It contains three duplicate words, whereas the lower order ones each contain words that are all different.  Furthermore, the words in the Borgmann Tensquare are quite abstruse, being extracted from seven different sources of reference. 
The current objective in the search for a generally-accepted Tensquare, which has thwarted formists for more than a century, is to employ words found only in Standard English Dictionaries.

Can you improve on Ted's effort, shown at below?  Though it satisfies the dictionary criteria, not all words  used consist of ten letters.  Some ten-letter sets are two-word phrases; SATIN WEAVE, however, is a dictionary listing.

More references to Word Squares can be found in Ted Clarke's new book "HOW THICK IS A SHADOW?"