Synonyms of proficiency in English:

proficiency


See US English definition of proficiency

See UK English definition of proficiency

See Spanish definition of competencia

noun

1‘her proficiency was obvious to everyone who sailed with her’

SYNONYMS
skill, skilfulness, expertise, experience, ability, capability, capacity, competence, competency, adeptness, adroitness, excellence, mastery, prowess, professionalism, aptitude, deftness, dexterity, finesse, facility, effectiveness, accomplishment, aptness, expertness, talent
informal know-how
ANTONYMS

incompetence