What do the terms indentured servant and debtor have in common

When a person wanted to travel to the colonies, they would often become debtors because they couldn't pay for the trip, so instead of paying their debt using money, they would work for the person who pays their journey for free, which would make them an indentured servant, and they would work until they pay off their traveling expenses.

If a debtor wasn't able to pay his/her debt, they would be forced to become an indentured servant to work there debt off.