Man pages matching name yppasswdd in section 8:

yppasswdd.8.ja	debian 10 / manpages-ja
yppasswdd.8.en	debian 10 / nis
yppasswdd.8.ja	debian 11 / manpages-ja
yppasswdd.8.en	debian 11 / ypserv
yppasswdd.8.ja	debian 12 / manpages-ja
yppasswdd.8.en	debian 12 / ypserv