The phrase "bumper crop" refers to a plentiful or unusually large harvest of crops. There are various words that can be used as synonyms for the term, such as a bountiful harvest, a copious yield, an abundant crop, or a plentiful harvest. Another synonym for "bumper crop" is a rich harvest, which indicates a high yield of crops that are of excellent quality. Other words that can be used include a productive harvest, an overflowing yield, or a record crop. All of these words convey the sense of an excellent harvest that exceeds farmer's expectations and is a cause for celebration.