How many letters does the top answer for “a small book usually having a paper cover” have?

The most common answer is booklet (7 letters).

Crossword clue: a small book usually having a paper cover

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

booklet 7 letters wn-def

a small book usually having a paper cover

brochure 8 letters wn-def

a small book usually having a paper cover

a book with paper covers 50% similar → paperback, softback