Tag Alias: Gold_bars -> Gold_bar -> Gold_bullion

Gold_bars -> Gold_bar/Gold_bullion
Plural, Synonym. Take your pick.
Also Implication: Gold_bars -> Gold_bar/Gold_bullion

Also, don't forget Gold Ingot.

maybe gold_brick too?

Aliasd the variants to gold_bar

create alias gold_bars -> gold_bar
create alias gold_ingot -> gold_bar
create alias gold_bullion -> gold_bar
create alias gold_brick -> gold_bar