No other evidence that I know of, it just seems a priori more likely than any other specific word you could pick out.
“Avada” is up there.
But then why would Harry, remembering it, not recognize it and just say it was a “strange word”?
It’s almost certainly not the word Harry is thinking of. It is just a word with a rather high chance of being involved while creating horcruxes!
One more reason HJPEV cannot be allowed to learn the word, ‘horcrux,’ and a narrative reason, this time. When he looks up the making of them he’ll realize what happened and solve or nearly solve the plot.
“Avada” is up there.
But then why would Harry, remembering it, not recognize it and just say it was a “strange word”?
It’s almost certainly not the word Harry is thinking of. It is just a word with a rather high chance of being involved while creating horcruxes!
One more reason HJPEV cannot be allowed to learn the word, ‘horcrux,’ and a narrative reason, this time. When he looks up the making of them he’ll realize what happened and solve or nearly solve the plot.