counter for number of kinds or types

an origin, cause / a type, class / an interest, appeal

a seed / a kind, type, sort, class, or category / (taxonomy) a species

kind, sort, type, class, genus, order, family / similar example, parallel

kind, sort, type, the like / a similar thing, parallel / (taxonomy) a conventional grouping that corresponds to a class or an order / (logic) Short for 類概念 (ruigainen).

sort, kind, type

one day

oceanography

Kyūjitai form of 海洋学: oceanography

marine pollution