expert someone who has a lot of knowledge about something or skill at doing something:
a computer expert
an expert on beetles
It’s best to ask an expert.
specialist an expert who has studied a particular medical or technical subject for a long time and knows much more about it than other people:
She is a specialist in corporate finance.
My doctor sent me to see a heart specialist.
authority an expert whose knowledge and opinions are greatly respected:
The professor is one of the world’s leading authorities on African art.
connoisseur /ˌkɒnəˈsɜː $ ˌkɑːnəˈsɜːr/ an expert on food, art, literature, or design, who has had a lot of experience and knows when something is of very good quality:
He was a connoisseur of fine wines.
His works are popular among connoisseurs.
buff /bʌf/ informal someone who is very interested in a subject and knows a lot about it:
a wine buff
Jazz buffs will be familiar with the band’s first album.
virtuoso /ˌvɜːtʃuˈəʊsəʊ $ ˌvɜːrtʃuˈoʊsoʊ/ an expert player or performer:
The piece was played by violin virtuoso Pavel Sporcl.
a virtuoso pianist
expert advice
Get some expert advice before investing in a property.
expert opinion (=the opinions of people who know a lot about something)
Expert opinion on the matter is deeply divided.
expert evidence/testimony
Two doctors were called to give expert testimony at the inquiry.
expert knowledge
He has expert knowledge of the plants and animals in this area.
expert eye (=the eyes of someone who knows a lot about something)
To the expert eye, this is a beautiful example of early Roman pottery.
accomplished very skilful because you have had a lot of experience of doing something - used especially about musicians, artists, performers etc:
a highly accomplished pianist
She is one of the most accomplished theatre performers.
She's a popular dancer, and very accomplished.

[TahlilGaran] English Thesaurus ▲