Synonyms for Impost:

n.

duty, assessment, politics, tax, tariff, pay, levy, money. cargo, heavy, freight, load, burden, over, haul. impost (noun)
custom, springer, customs duty, customs.
tariff (noun)
custom, duty, levy, assessment, tax.

Other synonyms:

tariff, cargo. assessment, tax, burden. load, freight. haul. duty. Other relevant words:
cargo, assessment, over, freight, haul, load, pay, heavy, tax, politics, tariff, duty, burden, levy, money.