As nouns the difference between screed and document
is that
screed is a long discourse or harangue while
document is an original or official paper relied upon as the basis, proof, or support of anything else, including any writing, book, or other instrument conveying information pertinent to such proof or support any material substance on which the thoughts of men are represented by any species of conventional mark or symbol.
As verbs the difference between screed and document
is that
screed is (construction|masonry) to produce a smooth flat layer of concrete or similar material while
document is to record in documents.