Here is a list of nouns that start with MI.
mica, mice, micelle, microchemistry, microcosm
microcytochemistry, microfilm, micrometeorite, micrometer, microorganism
microphone, microphoning, microscope, microscopy, microwave
midair, midday, middle, midmorning, midnight
midpoint, midshipmen, midst, midstream, midsummer
midway, midweek, midwife, mien, might
migration, mike, mildew, mile, mileage
milestone, milieu, militant, militarism, militarist
military, militia, milk, mill, millenarianism
millenium, millennia, millennium, millidegree, milligram
milliliter, millimeter, millinery, milling, millionaire
millivoltmeter, milquetoast, min, mind, mine
miner, mineral, mineralogy, miniature, minimum
mining, minister, ministry, mink, minor
minority, minstrel, mint, minter, minuet
minute, minutiae, miracle, mirror, mirth
misalignment, misanthrope, misbehavior, miscalculation, miscegenation
miscellany, mischief, misconception, misconstruction, miscount
miscreant, misdemeanor, misery, misfortune, mishap
misinformation, misinterpretation, misnomer, misogynist, mispronunciation
misrepresentation, missile, missing, mission, missionary
missive, misstep, missy, mist, mistake
mistaking, mistletoe, mistrial, mistrust, misunderstanding
misuse, mitigation, mitre, mix, mixer
mixing, mixture
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