Hour vs. Our
Hue vs. Hew
Human vs. Humane
Hurdle vs. Hurtle
Illicit vs. Elicit
Imply vs. Infer
In vs. Into
Incidence vs. Incidents
Incite vs. Insight
Incredible vs. Incredulous
Indiscrete vs. Indiscreet
Ingenious vs. Ingenuous
Inn vs. In
Inquiry vs. Enquiry
Insidious vs. Invidious
Intense vs. Intent
Intrusive vs. Obtrusive
Kin vs. Ken
Knight vs. Night
Know vs. No