udon

is likely misspelled.

has no English definition.

As a noun udon

is a Japanese wheat noodle.

As a noun udon

is a japanese wheat noodle.

As a preposition upon is

being above and in contact with another.

As an adverb upon is

being the target of an action.

As nouns the difference between udon and udox

is that udon is a Japanese wheat noodle while udox is an oxisol in a humid climate.

As nouns the difference between don and udon

is that don is a university professor, particularly one at Oxford or Cambridge while udon is a Japanese wheat noodle.

As a verb don

is to put on, to dress in.

As a proper noun Don

is a diminutive of the male given name Donald or Gordon.