Why don't Americans write devor instead of devour to be consistent with the pervasiveness of using variations such as color and armor?
Learn English – Why don’t Americans write “devor” instead of “devour”
american-englishorthographypronunciation-vs-spelling
Best Answer
No it wouldn't, because devour doesn't rhyme with colour/color or armour/armor. It does rhyme with hour.
In other words, the ending -our is only respelled as -or when it represents an unstressed, r-colored schwa [ɚ]. The stressed diphthongs in hour, devour, flour, etc. retain their original spelling.