The Word You Keep Messing Up
Competition. C-O-M-P-E-T-I-T-I-O-N. Twelve letters. It is not complicated until you try to type it fast and your brain decides "pet" belongs somewhere else. I have seen it spelled as "compitition," "competision," "comepetition," and once, in a printed press release, "compitation." That last one was particularly painful to read. The word comes from the Latin competitio, which traces back to competere meaning "to come together." The root has nothing to do with fighting or rivalry in its original form, but that history doesn't help you spell it on a deadline.
How To Spell Competition Correctly Every Time
Here is the brute-force method that actually works: break it into syllables out loud. Com-pe-ti-tion. Two "t" sounds. One "p." That small gap between the two t's is where most people trip up. Your brain wants to merge them into a single t or rearrange the vowels, especially when you are under time pressure. I learned this the hard way during a podcast recording where I was reading sponsor names and company titles off a teleprompter. I said "competitive analysis" about six times in thirty seconds and each time my tongue wanted to drop the second "i." The producer flagged it in my ear and I had to re-record the entire segment. After that, I started subvocalizing the breakdown before speaking any word I was unsure about. Com-pe-ti-tive. Com-pe-ti-tion. It added roughly two seconds per word but eliminated every error. Here are the variations you will actually encounter in the wild:
Compete - the base verb. Five letters after the "com." Don't drop the second "e." Compete, not compete. Competitor - add "-itor" to compete. Seven more letters. Eight total after "com." I once wrote "competer" in a brief and my opposing counsel pointed it out. It was a small thing but it made me look sloppy in front of the judge. Competitive - the adjective form. Ten letters after "com." The "-itive" ending is the one that gets rearranged most often because "petitive" looks wrong even though it is correct. Your eye wants to see "petitive" as two separate chunks but it is one unit: t-i-t-i-v-e.
Get the Full Details

There is no shortcut trick that works universally. Mnemonics like "the pet sits in competition" exist online and they help some people. They did nothing for me. The only thing that stuck was the syllable breakdown approach combined with slow reading when it matters.
When Spellcheck Won't Save You
This is the part nobody talks about. Spellcheck will catch "compitition" and "competision" because those are genuine enough misspellings to register as wrong. But it will never flag "compeition" because that is close enough to a real word pattern that autocorrect on your phone will silently fix it without telling you. You will publish something with "compeition" in it and have no idea it happened. I caught this in my own writing after running a friend's text through a stricter grammar tool that flags near-miss variants. We both had been missing it for months. The fix is simple but counterintuitive: read your text backward when you are doing a final pass. Start from the last word and move to the first. Your brain stops predicting the next word and you actually see the letters in front of you. It takes longer but it catches things that normal reading glosses right over. Also worth noting: "competition" has no silent letters. Every letter is pronounced. That should make it easier to spell than words like "queue" or "colonel" but somehow it is not. The double "t" in the middle is the only feature that doesn't map cleanly to a single sound change, and that is exactly where the errors cluster.
Stick with Com-pe-ti-tion. Say it slowly. Check it backward. Move on.