the.com/practical
The opposite of clever-on-paper: it asks if the thing actually works.
means Concerned with real-world use and results rather than theory, ideals, or speculation.
from From Greek praktikos, fit for action, via praxis, doing — the word literally rolls up its sleeves.
Theory's foilDefined by contrast with abstract and theoretical.
Joke namesakeA practical joke is action, not punchline.
Exam termA practical tests doing, not reciting.