expertise

/ˌɛkspɚˈtiːs/noun

A high level of skill or deep knowledge in a specific subject or activity.

Example sentence

“Her expertise in tax law makes her a valuable adviser.”

An uncountable noun: you have expertise, never 'expertises' or 'an expertise'. Usually followed by 'in': expertise in tax law.

Related words

mentorAn experienced person who guides and advises someone with less experience.skillThe ability to do something well, usually gained through practice or training rather than something you are born with.traineeA person who is still learning a job while receiving formal instruction at work.credentialA document or digital record proving a person's status, qualifications, or rights.apprenticeA person learning a skilled trade by working under someone experienced.qualificationThe process of meeting the requirements for a job, position, or competition.