Ability
Capability
Synonyms: Capacity, potential, power, aptness, propensity, means, capability, potentiality, faculty, facility, wherewithal, and preparedness.
Expertise
Synonyms: Talent, expertise, adeptness, skilfulness, mastery, calibre, competence, proficiency, adroitness, cleverness, flair, gift, brilliance, qualification, savoir faire, skill, expertness, aptitude, prowess, artistry, accomplishment, competency, dexterity, deftness, smartness, finesse, knack, genius, resources, and know-how.
Example Sentences
She has the ability to lead.
His ability impressed the entire team.
They doubted her ability to succeed.
Practice improves your ability over time.
The ability to adapt is crucial.