IPA: /prəˈlɪfɪkəsi/
KK: /prəˈlɪfɪkəsi/
The quality of producing a lot of works, especially in literature or art, or being very fertile.
The prolificacy of the author is evident in the numerous books he has published over the years.
Prolificacy is formed from "prolific" (from Latin "prolificus", meaning producing offspring or fruit) and the suffix "-acy" (meaning the state or quality of). The word "prolificacy" refers to the quality or state of being prolific, or producing abundantly.
Think of 'producing abundantly' ('prolific') and remember that 'prolificacy' means the state of being able to produce a lot.
No commonly confused words.