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

貴意[kii] your will
貴簡[kikan] your letter
貴金属[kikinzoku] precious metal
貴顕[kiken] distinguished person
貴社[kisha] (your) company

貴重[kichou] precious
貴重品[kichouhin] valuables
貴紳[kishin] noble
貴族[kizoku] noble
貴族院[kizokuin] House of Lords