When describing someone who performs a task skillfully or with an advanced level of knowledge, there are several synonyms for "like an expert". These include "proficiently", "competently", "adeptly", "skilfully", "masterfully", "flawlessly" and "authoritatively". Additionally, one could use more specific words such as "specialist", "pro", "virtuoso" or "maestro". When discussing someone who has a lot of experience in a particular field or activity, other synonyms for "like an expert" include "seasoned", "veteran", "savvy" and "knowledgeable". These synonyms are useful in situations when describing individuals who demonstrate a high level of skill and can be used interchangeably in various contexts.