I used the word "bumped" in one of my topics, but I don't get a hit for it with "bump." I'm not sure if you'd be able to allow for more fuzzy matching, but I sometimes find that useful. Unless of course you are worried about excessive hits.
Depends on where you're doing it. This test forum doesn't use the "good" search back-end. Sites like CB and PB do.
"I made this!" POP Forums on Github
Closed topic.