Farthing and Red cent

Farthing noun - A former British bronze coin worth a quarter of a penny.

Red cent and farthing are semantically related In some cases you can replace phrase "Red cent" with "Farthing", this terms are similar.

Red cent noun - Something of little value.

Farthing and red cent are semantically related in insignificant value topic. You can use "Farthing" instead a noun phrase "Red cent".