ὀφειλήματα [1 verse](noun pl neut acc) "Debts" is opheilema, which means "that which is owed," and "debt." -- This word "debts" is sometimes translated as "sins" or "trespasses," but in the original Greek, it has only one meaning, "that which is owed." In this respect, the KJV is more accurate than more recent translations that render it differently for philosophical reasons.

ὀφειλέτης [4 verses](noun sg masc nom) "Which owed""Debtors" is opheiletes, which means "a debtor," "a person who owes a debt" or "one who is under a bond." -- The word for "debtor" is a form of the word for "debt" used above. It means someone who owes something, that is, someone who was under a bond. In Christ's era, a person under a bond was almost a slave until the debt was paid.

ὤφειλεν [5 verses](verb 3rd sg aor ind act) "Owed" is opheilô, which means "to owe," "to have to pay," "to be bound to render," "to be bound," "to be obliged," and "to account for."  - "Owed" are from a Greek verb that means "to owe," "to have to pay," and "to account for."

ὤφειλεν  [8 verses](verb 3rd sg imperf ind act) "Owed" is opheleo, a Greek word with three related but different meanings. The most common is "to owe," "to be bound," and "to be obliged." The next means "to strengthen" and to enlarge," and "to increase." The final one means "to help," "to aid," "to succor," "to be of use or service," "to enrich," and "to benefit."   - The  Greek word translated as "profit" has three related but different meanings.  Jesus uses several of them at different times. The most common is "to owe," "to be bound," and "to be obliged." The next means "to strengthen" and to enlarge," and "to increase." The final one means "to help," "to aid," "to succor," "to be of use or service," "to enrich," and "to benefit.

ὄφεις [7 verses](noun pl masc voc/nom/acc) "Serpents"is ophis, which means "serpent," "a serpent-like bracelet," "a specific constellation," "a creeping plant," and "a type of fish." It is a metaphor for "an arrow." -- The word translated as "serpent" is also a kind of fish. The "serpent" was used by Jesus both as a metaphor for wisdom (Mat.10:16) and, of course, an evil cunning. This is a reference to the Hebrew in Genesis 3:1, where the serpent is described as the cleverest of all animals. The bronze or brass snake raised by Moses in the desert to cure the Israelites from snakebite is an symbol for Christ being raised on the cross, John 3:14.