: 2,300 words that are well-known to natives but used less frequently. Italian Frequency Dictionary by Lingo Mastery : Often available via Google Books
For immediate study, you may prefer these highly-ranked practical dictionaries: Italian Frequency Dictionary Pdf
References and further reading
He learned that the Italian language has over two million word forms, but he only needed a tiny fraction to survive. : 2,300 words that are well-known to natives