亜種[ashu] subspecies
異機種[ikishu] heterogenous equipment
異種[ishu] different kind (species, variety)
育種[ikushu] (plant) breeding
育種家[ikushuka] (plant) breeder

育種所[ikushujo] (plant) nursery
一種[isshu] species
一粒種[hitotsubudane] an only child
種違い[tanechigai] half-brother
艶種[tsuyadane] love affair

夏蚕[natsugo] summer silkworms
蚕業[sangyou] sericulture
蚕具[sangu] sericultural equipment
蚕座[sanza] silkworm basket
蚕糸[sanshi] silk thread

蚕糸業[sanshigyou] sericulture industry
蚕糸試験所[sanshishikenjo] silk experiment station
蚕紙[sanshi] silkworm-egg paper
蚕児[sanji] silkworm