The difference between Header and Trailer
When used as nouns, header means the upper portion of a page (or other) layout, whereas trailer means someone who or something that trails.
When used as verbs, header means to strike (a ball) with one's head, whereas trailer means to load on a trailer or to transport by trailer.
check bellow for the other definitions of Header and Trailer
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Header as a noun:
The upper portion of a page (or other) layout.
Examples:
"If you reduce the header of this document, the body will fit onto a single page."
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Header as a noun:
Text, or other visual information, used to mark off a quantity of text, often titling or summarizing it.
Examples:
"Your header is too long; "Local Cannibals" will suffice."
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Header as a noun:
Text, or other visual information, that goes at the top of a column of information in a table.
Examples:
"That column should have the header "payment status"."
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Header as a noun (informal):
A font, text style, or typesetting used for any of the above.
Examples:
"Parts of speech belong in a level-three header. Level-two headers are reserved for the name of the language."
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Header as a noun (computing):
The first part of a file or record that describes its contents.
Examples:
"The header includes an index, an identifier, and a pointer to the next entry."
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Header as a noun (programming):
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Header as a noun (networking):
the first part of a packet, often containing its address and descriptors
Examples:
"The encapsulation layer adds an eight-byte header and a two-byte trailer to each packet."
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Header as a noun:
A brick that is laid sideways at the top of a wall or within the brickwork with the short side showing; compare stretcher.
Examples:
"This wall has four header courses."
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Header as a noun:
A horizontal structural or finish piece over an opening.
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Header as a noun:
A machine that separates and gathers the heads of grain etc.
Examples:
"They fed the bale into the header."
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Header as a noun (soccer):
The act of hitting the ball with the head.
Examples:
"His header for the goal followed a perfect corner kick."
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Header as a noun (soccer):
Someone who heads the ball
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Header as a noun:
A headlong fall or jump.
Examples:
"The clown tripped over the other clown and took a header."
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Header as a noun:
A raised tank that supplies water at constant pressure, especially to a central heating and hot water system.
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Header as a noun:
A pipe which connects several smaller pipes.
Examples:
"Common practice is to use plastic pipes with iron headers."
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Header as a noun:
The rodeo performer who drives the steer toward the heeler to be tied.
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Header as a verb (sports, transitive):
To strike (a ball) with one's head.
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Trailer as a noun:
Someone who or something that trails.
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Trailer as a noun:
Part of an object which extends some distance beyond the main body of the object.
Examples:
"synonyms: appendage attachment appendix extension extrusion"
"the trailer of a plant"
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Trailer as a noun:
An unpowered wheeled vehicle, not a caravan or camper, that is towed behind another, and used to carry equipment, etc, that cannot be carried in the leading vehicle.
Examples:
"At the end of the day, we put the snowmobiles back on the trailer."
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Trailer as a noun (US):
A furnished vehicle towed behind another, and used as a dwelling when stationary; a caravan; a camper.
Examples:
"We drove our trailer to Yellowstone Park."
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Trailer as a noun (US):
A prefabricated home that could be towed to a new destination, but typically is permanently left in an area designated for such homes.
Examples:
"The young couple′s first home was in a trailer."
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Trailer as a noun (chiefly, US, media):
A preview of a film, video game or TV show.
Examples:
"The trailer for that movie makes it seem like it would be fun."
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Trailer as a noun:
A short blank segment of film at the end of a reel, for convenient insertion of the film in a projector.
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Trailer as a noun (computing):
The final record of a list of data items, often identified by a key field with an otherwise invalid value that sorts last alphabetically (e.g., “ZZZZZ”) or numerically (“99999”); especially common in the context of punched cards, where the final card is called a trailer card.
Examples:
"The linked list terminates with a trailer record."
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Trailer as a noun (networking):
The last part of a packet, often containing a check sequence.
Examples:
"The encapsulation layer adds an eight-byte header and a two-byte trailer to each packet."
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Trailer as a verb:
To load on a trailer or to transport by trailer.
Examples:
"The engine wouldn't run any more so we had to trailer my old car to the wrecking yard."