Posting this, because I'm always forgetting them 😄

#Esperanto ki- (question) words

kial : what for, why, for what reason
kiam : as, when
kian : what kind of, what sort of
kia : what a, what kind of, what sort of
kiel : as, like, such as, how, in what way, such a, what a
kien : where to
kieo : whereabouts
kies : of which, which one’s, whose
kie : where
kiom : how many, how much
kio : that, which
kiuj : that, which, who
kiun : which, which one, that, who
kiu : that, which (one), who

Source: http://denisowski.org/Esperanto/ESPDIC/espdic_readme.html