A colonel is a senior military officer. A kernel is the inner part of a nut or seed, or the core of something. They are pronounced the same, so only the spelling and meaning tell them apart.
The core difference
A colonel is a senior military rank, while a kernel is the edible inside of a nut or seed, or the central core of an idea or system.
- colonel — a senior military officer rank, just below a general: She was promoted to colonel after fifteen years of service.
- kernel — the edible part of a nut or seed, or the core of something: There's a kernel of truth in what he said.
How to tell them apart
Both words are pronounced "KER-nul". The odd spelling of colonel comes from its history: the English spelling was changed to match Italian, but the older pronunciation with an "r" sound stayed. So the spelling does not match the sound.
Memory trick: colonel comes via Italian from a word for a commander of a column of soldiers, so think of the officer leading a column. Kernel comes from a word meaning "little grain", so think of corn. In computing, the kernel is the central part of an operating system.
