عَرْبٌ

is synonym with إِعْرَابٌ in the sense of إِفْصَاحٌ [but apparently as a subst. (not a verbal noun) meaning Clear, plain, or distinct, speech]. (TA.)

And synonym with عِرَابَةٌ, q. v. (TA.)

And synonym with عَرَبٌ as [verbal noun of عَرِبَ, and] meaning نَشَاطٌ [i. e. Briskness, liveliness, or sprightliness]. (O, K.)