Mammoth Uncensored Word List:
19 - 11 letter words starting with yo

yoctojoules yoctoliters yoctolitres yoctometers yoctometres yoctonewton yoctosecond yoctoteslas yokefellows yottajoules yottaliters yottalitres yottameters yottametres yottanewton yottasecond yottateslas youngnesses youthquakes