As nouns the difference between biller and willer
is that biller is an issuer of a bill while willer is one who wills, who causes by an act of will or willpower.
biller
English
Noun
(
en noun)
(business) An issuer of a .
Anagrams
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willer
English
Noun
(
en noun)
One who wills, who causes by an act of will or willpower.
One who causes an inheritance by writing a will.