Which word does NOT belong with the others? heading, body, letter, closing

Given data

• Word list: heading, body, letter, closing.

Concept/Approach
Three are sections/components of a letter; one is the whole document.

Step-by-Step reasoning
Heading – component (sender's address/date or title). Body – main message/content of a letter. Closing – complimentary close/sign-off. Letter – the complete composition that includes those sections.

Verification/Alternative
Analogy: wheel, engine, door vs. car—'letter' is to the others as 'car' is to its parts.

Common pitfalls

• Overlooking that 'letter' is a container term, not a section.

Final Answer
letter