“UMIACK” is a valid word. — 14 points Scrabble

mick(ethnic slur) offensive term for a person of Irish descent
macka waterproof raincoat made of rubberized fabric
muckany thick, viscous matter
micaany of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity
kamione the Shinto deities (including mythological beings, spirits of distinguished men, forces of nature)

maca waterproof raincoat made of rubberized fabric
aiman anticipated outcome that is intended or that guides your planned actions
cama river in east central England that flows past Cambridge to join the Ouse River
cumthe thick white fluid containing spermatozoa that is ejaculated by the male genital tract
ami
ick
amu
aukblack-and-white short-necked web-footed diving bird of northern seas

ama radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms
um
mainformal terms for a mother
midestruction of heart tissue resulting from obstruction of the blood supply to the heart muscle
aian agency of the United States Army responsible for providing timely and relevant and accurate and synchronized intelligence to tactical and operational and strategic level commanders
kaunknown god; an epithet of Prajapati and Brahma
muthe 12th letter of the Greek alphabet

UMIACK