As nouns the difference between terms and ballastage
is that terms is while ballastage is a toll paid for the privilege of taking up ballast in a port or harbour.
terms
English
Noun
(head)
Statistics
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ballastage
English
Noun
A toll paid for the privilege of taking up ballast in a port or harbour.
Coordinate terms
* (
fee for anchoring) anchorage, cranage, demurrage, shippage, shorage, tonnage, wharfage
(
Webster 1913)