different between fertileness vs fecundity

English

fertile +? -ness

fertileness (uncountable)

(rare) The state or characteristic of being fertile.
- c. 1583, Sir Philip Sidney, A Defence of Poesie and Poems, "An Apologie for Poetrie":
  ... and he, according to the fertileness of the Italian wit, did not only afford us the demonstration of his practice, but sought to enrich our minds.
- 2001, Maureen Anderson, "Unraveling the Southern Pastoral Tradition," Southern Literary Journal, vol. 34, no. 1, p. 4:
  The fertileness of Place du Bois, "rich in its exhaustless powers of reproduction," reflects a golden age of easy life.

From Latin f?cundit?s (“fruitfulness, fertility”), from f?cundus.

fecundity (usually uncountable, plural fecundities)

Ability to produce offspring.
- 2006, Neil Gaiman, “Neil Gaiman on Terry Pratchett” in: Good Omens, Corgi, p. 410
  In the early days the reviewers compared him to the late Douglas Adams, but then Terry went on to write books as enthusiastically as Douglas avoided writing them, and now, if there is any comparison to be made of anything from the formal rules of a Pratchett novel to the sheer prolific fecundity of the man, it might be to P. G. Wodehouse.
Ability to cause growth.
Number, rate, or capacity of offspring production.
Rate of production of young by a female.

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