PROFICIENT n. 2 definitions
One who has made considerable advances in any business, art, science, or branch of learning; an expert; an adept; as, proficient in a trade; a proficient in mathematics, music, etc.
PROTECTOR n.
A cardinal, from one of the more considerable Roman Catholic nations, who looks after the interests of his people at Rome; also, a cardinal who has the same relation to a college, religious order, etc. Lord Protector (Eng. Hist.), the title of Oliver Cromwell as supreme governor of the British Commonwealth (1653-1658).…