Comerciante vs. mercader

The Spanish words 'comerciante' and 'mercader' both translate to 'merchant' or 'trader' in English. However, there are subtle differences in their usage and connotations.

Comerciante

'Comerciante' generally refers to a person who buys and sells goods, typically in a legal and formalized way. This term is broad and can apply to various types of trade, ranging from small business owners to large-scale operators in commerce.
Mi tío es un comerciante exitoso y tiene varias tiendas.
(My uncle is a successful merchant and owns several stores.)
Los comerciantes del mercado venden fruta fresca cada día.
(The market traders sell fresh fruit every day.)
Cada comerciante debe seguir las regulaciones del comercio local.
(Each merchant must follow the local trade regulations.)

Mercader

'Mercader' has a more traditional or archaic connotation and often refers to a person engaged in buy-and-sell activities from previous centuries. The term may also evoke images of traveling traders dealing in goods such as spices, textiles, or other commodities across different regions or countries.
El mercader recorrió muchos países llevando seda y especias.
(The merchant traveled through many countries carrying silk and spices.)
En la época medieval, los mercaderes eran esenciales para el comercio internacional.
(In the medieval era, merchants were essential for international trade.)
Las caravanas de mercaderes cruzaban el desierto para vender sus productos en mercados lejanos.
(The caravans of merchants crossed the desert to sell their products in distant markets.)

Summary

While both 'comerciante' and 'mercader' can be translated as 'merchant' or 'trader', 'comerciante' is used in contemporary contexts for individuals involved in modern trade activities. On the other hand, 'mercader' is often used to describe historical trade practices or traditional trading activities.