I.
noun
ADJECTIVE
▪ college ( BrE ), school ( esp. AmE )
▪ elementary-school , high-school , middle-school (all AmE )
▪ independent-school , private-school , public-school (all AmE )
▪ assistant , vice
II.
adj.
Principal is used with these nouns: ↑ actor, actress , ↑ adviser , ↑ agent , ↑ aim , ↑ analyst , ↑ aspect , ↑ asset , ↑ bedroom , ↑ brand , ↑ cause , ↑ character , ↑ characteristic , ↑ component , ↑ conductor , ↑ contributor , ↑ dancer , ↑ designer , ↑ disadvantage , ↑ effect , ↑ element , ↑ enemy , ↑ exponent , ↑ export , ↑ feature , ↑ focus , ↑ ingredient , ↑ instrument , ↑ lecturer , ↑ means , ↑ method , ↑ minister , ↑ negotiator , ↑ object , ↑ objection , ↑ objective , ↑ officer , ↑ part , ↑ partner , ↑ purpose , ↑ reason , ↑ recommendation , ↑ repayment , ↑ residence , ↑ rival , ↑ role , ↑ shareholder , ↑ shopping centre , ↑ soprano , ↑ source , ↑ speaker , ↑ sponsor , ↑ stockholder , ↑ street , ↑ supporter , ↑ target , ↑ task , ↑ thesis , ↑ type , ↑ witness