The dictionary has many more. But not every "im-" beginning is a prefix; for example, "imagine" and "imply" are not in this category.
Other "im" words include:
imagination, imagine, image, images, imaginary, imitation, imbalanced, imbalance, imitate, immigrant, immigrate, Immigration, immerse, immense, immature, immune, immunity, impact, impartial, important, impairment, impassioned, impale, immediate, immediately, imposition
impatient
Words that begin with the prefix "ie" include "ielectric," "iefficient," and "iempower."
Immaterial, immature, immeasurable, immodest, immoral and immovable begin with IM. They mean not.
Words with the prefix -im:immaterialimmatureimmobileimmortalimpartialimperfectimpossibleimpracticalimproperWords with the prefix -in:inaccurateinactiveincalculableincapableincapacitateinconceivableindescribableindiscriminateindivisibleineffectiveingrowninvisibleinvoluntary
incredible
insert
outside
Some words are:OfficeOfficiencyOffensiveOffenseOf
carnivorous
hexagon
Syllable
microscope
telescopescoop