Copped off brightknightie, and clearly going the rounds:

Meme: Share links to your fics with the most hits, second-most kudos, third-most comment threads, fourth-most bookmarks, fifth-most words, and fewest words.

Most hits:
Dick Francis's 10-lb Penalty: "Back in the Saddle" (6886 hits) (2016, 1866 words)

Second-most kudos:
Georgette Heyer's Venetia: "The Rape of the Book" (121 kudos) (2016, 6350 words)

Third-most comment threads:
Mary Renault's The Charioteer: "Exit Stage Left, a Wounded Warrior: The Lost Chapters of The Charioteer" (17 comment threads) (2012, 12,429 words)

Fourth-most bookmarks:
M*A*S*H (TV series): "Dear Sister-the-Sister" (11 bookmarks) (2011, 1400 words)

Fifth-most words:
"Exit Stage Left" again (12,429 words).

Fewest words:
I'm going to omit those with zero words. Two of these are artwork (and hence not fic). The third is a picture book whose words are with the pictures attached to the pics and hence not counted by AO3. Counted up by hand, though, it has a lot more more words than the story below:

Mary Renault's The King Must Die: "I Leap the Bull" (96 words) (2015)

Actually, I think this was supposed to be a drabble. (Maybe I was counting the title in by accident.) At any rate, I also have another fourteen drabbles or near-drabbles, given that the word count can shift when one copies from Word over to AO3.