Common Words:
* Inadequate
* Inexpensive
* Inexperience
* Inexperienced
* Inexplicable
* Inexplicit
* Inadvertent
* Illegal
* Illiterate
* Illustrious
* Imaginary
* Imitation
* Immediate
* Immense
* Impertinent
* Implausible
* Implication
* Impossible
* Impromptu
* Improper
* Imprudent
* Incentive
* Incident
* Incomplete
* Incorrect
* Inconsistent
* Inconvenience
* Incredible
* Indefinite
* Independent
* Indicate
* Indirect
* Individual
* Induce
* Industry
* Ineffective
* Inefficient
* Inequality
* Inevitable
* Infection
* Inferior
* Infinite
* Inflammation
* Influence
* Informal
* Information
* Inhabitant
* Inhibition
* Initial
* Initiative
* Injury
* Ink
* Innocent
* Inorganic
* Inquiry
* Insane
* Insect
* Inside
* Insight
* Inspect
* Instance
* Instant
* Institution
* Instrument
* Insulate
* Integer
* Integral
* Intellect
* Intelligent
* Intense
* Intention
* Interact
* Interest
* Interior
* Internal
* Internet
* Interpret
* Interrupt
* Interval
* Interview
* Intolerant
* Introduce
* Inventory
* Invest
* Investigation
* Invisible
* Invite
* Invoice
* Iron
* Island
* Issue
Less Common Words:
* Ie (Latin for "that is")
* Iridescent
* Irascible
* Irregular
* Irrelevant
* Irreplaceable
* Irresistible
* Irresponsible
* Irreversible
* Isometric
* Isobars
* Isotopes
Note:
* The "ie" prefix isn't as common as some other prefixes.
* Many of the words listed above can be used as nouns, verbs, or adjectives depending on context.
If you have a specific topic in mind, let me know and I can help you find words starting with "ie" that are relevant.