Mastery

/ˈmɑːst(ə)ri/

noun

comprehensive knowledge or skill in a particular subject or activity.

synonyms: proficiency, ability, capability;

control or superiority over someone or something.

synonyms: control, superiority, domination, command, ascendancy, supremacy, pre-eminence, triumph, victory, the upper hand, the whip hand, rule, government, power, sway, authority, jurisdiction, dominion, sovereignty