The odd terms in the sentences are customer, commission, destination, separate and career.
Odd term in a sentence refers to any term that does not align with the sense or use of other terms.
In the first sentence all the terms interpreter, travel agent, booking agent, guide, ticket agent are related to travelling but only one term i.e. customer is not used in the same sense.
In the second sentence, all of the terms are related but commission.
Similarly, in the third sentence the only irrelevant term is destination.
In fourth sentence, the odd term is separate.
In the last sentence, the word career is unusual.
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