小滝[otaki] cascade
滝口[takiguchi] top of a waterfall
滝川[takigawa] rapids
滝つぼ[takitsubo] basin under a waterfall

滝登り[takinobori] (fish) climbing (swimming) up waterfall
白滝[shirataki] noodles made from konnyaku
雌滝[medaki] the smaller waterfall (of the two)
男滝[odaki] greater waterfall (of the two)