First-rate and Worthwhile

First-rate adjective - Of the very best kind.

Worthwhile and first-rate are semantically related. In some cases you can use "Worthwhile" instead an adjective phrase "First-rate".

Worthwhile adjective - Sufficiently valuable to justify the investment of time or interest.

First-rate and worthwhile are semantically related. Sometimes you can use "First-rate" instead an adjective "Worthwhile".