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

零し話[koboshibanashi] complaining
取零す[torikobosu] to lose an easy game
爪で拾って箕で零す[tsumedehirottemidekobosu] penny wise and pound foolish
零落れる[ochibureru] to be ruined
零す[kobosu] to spill

零れる[koboreru] to spill
零下[reika] below zero
零行列[reigyouretsu] zero matrix
零細[reisai] insignificant