First-rate and Well-known

First-rate adjective - Of the very best kind.

Well-known and first-rate are semantically related in distinguished topic. In some cases you can use "Well-known" instead an adjective phrase "First-rate".

Well-known adjective - Widely known.

First-rate and well-known are semantically related in distinguished topic. Sometimes you can use "First-rate" instead an adjective phrase "Well-known".