Open English Wordnet
Nouns
(n)concretea strong hard building material composed of sand and gravel and cement and water Verbs
(v)concretecover with cement“concrete the walls” (v)concreteform into a solid mass; coalesce Adjectives
(a)concretecapable of being perceived by the senses; not abstract or imaginary“concrete objects such as trees” (s)concreteformed by the coalescence of particles