Fecund
Part of speech: adjective
Definition: Highly fertile; able to produce offspring. Leading to new ideas or innovation.
Productive
Part of speech: adjective
Definition: Capable of producing something, especially in abundance; fertileyielding good or useful results; constructiveOf, or relating to the creation of goods or servicesconsistently applicable to any of an open set of words
Example sentence: So that the record of history is absolutely crystal clear. That there is no alternative way, so far discovered, of improving the lot of the ordinary people that can hold a candle to the productive activities that are unleashed by a free enterprise system.