Mammoth Uncensored Word List:
48 words ending with my, 8 letters long

aeronomy agronomy allogamy antinomy antonymy autogamy autonomy autotomy blossomy caconymy colotomy didynamy endogamy eurythmy gorblimy hologamy homogamy homonymy hyponymy lobotomy meronymy metonymy misogamy monogamy monosemy monosomy myectomy nonfoamy oncotomy paronymy phantomy phisnomy polygamy polysemy polysomy porogamy sunbeamy synonymy taxonomy tenotomy theonomy thingamy toponymy urostomy vagotomy vasotomy xenogamy xylotomy