The horses that competed in the 2020 Kentucky Derby included Authentic, Tiz the Law, Honor A. P., Thousand Words, Ny Traffic, King Guillermo, Mr. Big News, Storm the Court, Major Fed, Finnick the Fierce, Money Moves, South Bend, Necker Island, Sole Volante, Attachment Rate, Winning Impression, and a few others. Some notable horses were Authentic (the winner), Tiz the Law (heavy favorite), and Honor A. P. Several horses were scratched close to the race day, such as Finnick the Fierce and Thousand Words.
If looking for the full official field with jockeys and odds, I can provide a detailed list as well.