As nouns the difference between keener and deener
is that keener is one who keens at a funeral while deener is a shilling.
As an adjective keener
is comparative of keen.
keener
English
Adjective
(head)
(keen)
Noun
(
en noun)
(dated) One who keens at a funeral.
(informal, UK, Canada) Someone who is excessively keen or eager, possibly making others look bad; a brown-noser.
deener
English
Noun
(
en noun)
(AU, slang) A shilling.
* 1985 , (Peter Carey), Illywhacker , Faber and Faber 2003, p. 370:
*:‘You're very fortunate.’ ‘I worked for it, every zac and deener .’