illegitimacy (being born out of wedlock)

a privately-owned ricefield, especially one under the historical 律令 (Ritsuryō) system

personal grudge

Kyūjitai form of 私鉄 (“private railway”)

a European water vole (Arvicola amphibius)

a fourspine sculpin (species Cottus kazika); very similar to the kajika (see below), but larger

(rare) a fourspine sculpin (species Cottus kazika); very similar to the kajika (see below), but larger

a Japanese fluvial sculpin (species Cottus pollux); very similar to the kamakiri (see above), but smaller

a Japanese fluvial sculpin (species Cottus pollux), more commonly known as 鰍 (kajika)

I don't speak Japanese