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.