concrete (adj) – real, solid, or specific; made of concrete
BREAKDOWN: CON- (with) + CRE- (grow)
— concrete is also a building material made of cement, water, and mineral aggregate
— concretion is the act, process, or result of aggregating or solidifying (also concretization)
This word is built on the root CRE-, which means to grow or increase.
Common CRE- words include crescent, crew, decrease, or increase.
More esoteric CRE- words include accretive and decremental.