The correct spelling for "reoson" is actually "reason". Commonly misspelled words can be tricky, but here are a few suggestions to avoid this mistake: 1) Sound it out phonetically: "ree-zuhn". 2) Remember the "a" and "o" order: "a" like "aardvark" comes before "o" like "octopus". 3) Utilize spell-check tools for instant corrections.