I feel like spending a week as a shoe salesman to help me instinctively spell feet and heel. Both of these have caused me many pauses because of momentary doubt.
I should have it down by now: I wear a EE shoe width (though a EEE is usually welcome), so I think of that to find the correct spelling. Feet and heel both have the shoe size in the middle.
Feat and heal are entirely different words that sound exactly the same. While feet is the plural of the ancient word foot, a feat is related to the word fact and comes to English through the French word fait. It was often neutral, just any sort of deed, but now it is used to mean a significant achievement. For heal, remember health, which is related to the word whole.
The same vexing vowel pairs is found in week and weak. A week has seven days, and e is used twice in week and seven. Both words have been around for more than a thousands years but are unrelated.
You peek with your eyes, so remember the repeated vowels there. A peak is at the top of a mountain as with the top of the letter A. (Pique comes to us from French, meaning to prick, and we can be in a pique of irritation or have our interest piqued.)
Steel is the metal alloy, and metal inconveniently has an a in it. All we can do is steal a quick look in the dictionary or steel ourselves to the task of remembering the difference.
Spellcheck should help you avoid feal, unless you seek an adjective for someone loyal.
A flea may flee, old leeks left at the back of the fridge might leak, and the pealing of a bell might signal that it’s time to start peeling the potatoes. A clarinetist better read up on the best reeds, and it would seem that a weak seam could cause an unseemly situation.