[かいそう, kaisou] (n) class; level; stratum; layer; hierarchy; (P) #9173
[じょうそう, jousou] (n) upper stratum (classes, stories, storeys); (P) #12668
[ちそう, chisou] (n) stratum; geological formation; layer; bed (coal, gravel, etc.); (P) #17295
[auronokararosutora-toumu] (n) Aulonocara rostratum (species of peacock cichlid from Lake Malawi)
[ロームそう, ro-mu sou] (n) stratum of loam
[ronguno-zu . sa-jonfisshu ; ronguno-zusa-jonfisshu ; ronguno-zu . sa-janfisshu ; ro] (n) longnose surgeonfish (Zebrasoma rostratum, species of Eastern Central Pacific tang)
[ちゅうせきそう, chuusekisou] (n) alluvium; alluvial stratum
[かくそう, kakusou] (n) each stratum; each class
[きそう, kisou] (n) base layer; substratum; binder course
[こうぼくそう, koubokusou] (n) overstory (overstorey); canopy layer; tree stratum
[じじゅんかせき, jijunkaseki] (n) index fossil (fossil which suggests a date of the formation of a rock stratum); key fossil; leading fossil
[しゃかいそう, shakaisou] (n) stratum of society
[ていしつ, teishitsu] (n) bottom material; bed material; sludge; sediment; substratum
[ねんどそう, nendosou] (exp) layer of clay; clay stratum
[ゆそう, yusou] (n) an oil stratum
[かりゅうそう, karyuusou] (n) granular layer; stratum granulosum