What is another word for expertise?

Here are some synonyms for "expertise," depending on the specific context:

General:

* Skill

* Proficiency

* Mastery

* Competence

* Know-how

* Specialization

* Talent

* Ability

More Formal:

* Acumen

* Savvy

* Craftsmanship

* Eminence

* Authority

Informal:

* Knack

* Gift

* Talent

* Know-how

For specific areas:

* Technical expertise (for technical skills)

* Clinical expertise (for medical skills)

* Financial expertise (for financial skills)

The best synonym will depend on the specific context and the level of formality desired.