“MINIMILLS” is a valid word.

minimsa British imperial capacity measure (liquid or dry) equal to 1/60th fluid dram or 0.059194 cubic centimeters
simlin

millsUnited States architect who was the presidentially appointed architect of Washington D.C. (1781-1855)
minisa very short skirt
minima British imperial capacity measure (liquid or dry) equal to 1/60th fluid dram or 0.059194 cubic centimeters
nills
limnstrace the shape of

milla plant consisting of one or more buildings with facilities for manufacturing
slimtake off weight
minia very short skirt
nilsa quantity of no importance
sillstructural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure
illsan often persistent bodily disorder or disease; a cause for complaining
milsa Cypriot monetary unit equal to one thousandth of a pound
nisinot final or absolute
nill
linsUnited States sculptor and architect whose public works include the memorial to veterans of the Vietnam War in Washington (born in 1959)
limntrace the shape of
nimsgame in which matchsticks are arranged in rows and players alternately remove one or more of them; in some versions the object is to take the last remaining matchstick on the table and in other versions the object is to avoid taking the last remaining matchstick on the table

illan often persistent bodily disorder or disease; a cause for complaining
sinestrangement from god
linUnited States sculptor and architect whose public works include the memorial to veterans of the Vietnam War in Washington (born in 1959)
sim
mila Cypriot monetary unit equal to one thousandth of a pound
nila quantity of no importance
insan agency in the Department of Justice that enforces laws and regulations for the admission of foreign-born persons to the United States
nimgame in which matchsticks are arranged in rows and players alternately remove one or more of them; in some versions the object is to take the last remaining matchstick on the table and in other versions the object is to avoid taking the last remaining matchstick on the table
lis
mis
mim
isma belief (or system of beliefs) accepted as authoritative by some group or school

ishave the quality of being; (copula, used with an adjective or a predicate noun)
ina unit of length equal to one twelfth of a foot
mma metric unit of length equal to one thousandth of a meter
lia soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals
midestruction of heart tissue resulting from obstruction of the blood supply to the heart muscle
sia tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors

MINIMILLS