concrete vs practical

concrete is a noun but practical is not a noun.

Word	Noun	Adjective	Verb	Adverb
concrete	Yes	Yes	Yes	No
practical	No	Yes	No	No

concrete (noun)	practical (noun)
a strong hard building material composed of sand and gravel and cement and water

concrete (adjective)	practical (adjective)
capable of being perceived by the senses; not abstract or imaginary	concerned with actual use or practice
formed by the coalescence of particles	having or put to a practical purpose or use
	guided by practical experience and observation rather than theory
	being actually such in almost every respect

concrete (verb)	practical (verb)
form into a solid mass; coalesce
cover with cement