Although the expression 'going on foot' is more often used, 'going by foot' is equally correct.
Comparing the usage of 'on' and 'by', most people would say they are going by car, by train, by air, etc., when traveling, not on car, on train, or on air. If riding a bicycle, it would be correct to say you are going by bicycle, not going on bicycle.
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Made up nursery rhyme.
walk
walk
Yes, the word 'walks' is a noun, the plural form of the noun 'walk'; a word for an instance of going by foot; a word for a path or a course to travel by foot; a word for a distance to go by foot; a word for a manner of movement by foot; a word for a social or economic status; a word for a thing.The word 'walks' is also the third person, singular, present of the verb to walk.
Walk-ins is correct, as in "The exam centre allows people to do walk-ins."