Quarterly Update 21, Summer 2020
| Headword | Part of Speech | Update Type |
| alligator | n1 | Revised Sense |
| anaconda | n | New Entry |
| bloodweed worm | n | New Entry |
| bloodweed | n | Revised Entry |
| bullweed worm | n | New Entry |
| caseworm | n | Revised Entry |
| conniption bug | n | Revised Entry |
| crock | n4 | Revised Entry |
| devil scratcher | n | Revised Entry |
| dragon | n | Revised Sense |
| flip-flap | n | Revised Sense |
| go-devil | n | Revised Sense, New Sense |
| gogglegoy | n | Revised Entry |
| hell-devil | n | Revised Entry |
| hell-diver | n | Revised Sense |
| hellgrammite | n | Revised Sense, New Senses |
| horseweed worm | n | New Entry |
| long green | n | New Entry |
| pennywinkle | n | Revised Sense, New Sense |
| periwinkle | n2 | Revised Sense, New Sense |
| ragweed worm | n | Revised Entry |
| rock bait | n | New Entry |
| rock fly | n | New Entry |
| rock worm | n | Revised Sense, New Sense |
| rock-roller | n | Revised Sense |
| snake doctor | n | Revised Entry |
| spider | n | New Sense |
| thunderbug | n | New Entry |
| weed worm | n | New Entry |