There are 16 words that start with 'upgr'.
| upgrew | upgrow |
| upgrade | upgrown |
| upgrows | upgraded |
| upgrades | upgrowth |
| upgrading | upgrowing |
| upgrowths | upgradable |
| upgradeable | upgradability |
| upgradeability | upgradabilities |
Note: These 16 words that start with 'upgr' are found from the USA & Canada version of the tournament Scrabble word list.