usefull

As adjectives the difference between worthy and usefull

is that worthy is having worth, merit, or value while usefull is misspelling of lang=en.

As a noun worthy

is a distinguished or eminent person.

As a verb worthy

is to render or treat as worthy; exalt; revere; honour; esteem; respect; value; reward; adore.

As adjectives the difference between helpful and usefull

is that helpful is furnishing help; giving aid; useful while usefull is misspelling of lang=en.