It depends on whether English is their first language or a second one just learning. Either way, calling them anything does not help much.
a jock?
"omnipresent"
A person whose arteries to the heart become clogged has a cholesterol.
A nonagenarian.
English
A native English speaker.
An orphan
rhapsodic
you call them sir or ma-am
lumber-jack
Scientist
Someone whose favorite color is undeniably purple...