A reverse alphabetical word is one whose letters appear in strict descending alphabetical sequence from beginning to end.
The reverse counterpart of Aeolian words, reverse alphabetical words move strictly backwards through the alphabet from Z toward A. Longest English examples include 9-letter "spoonfeed" and 8-letter words like "spoonfed", "trollied", "sniffed", "spiffed", "sponged", "spoofed", and "spooked". Everyday shorter examples include "wrong", "troll", "sponge", and "feed".
Test any English word to verify descending alphabetical letter sequence:
Verified English words exemplifying reverse alphabetical words with Scrabble scores
Linguistic definitions, etymological origins, and tournament usage
A reverse alphabetical word is one in which each successive letter is equal to or alphabetically earlier (closer to A) than the preceding letter.