different between transportation vs loopback

English

From transport +? -ation.

transportation (usually uncountable, plural transportations)

The act of transporting, or the state of being transported; conveyance, often of people, goods etc.
We have to get people out of their cars and encourage them to use alternative forms of transportation.
(historical) Deportation to a penal colony.
Mulligan's sentence was commuted from death to transportation.
(US) A means of conveyance.
Nice transportation, dude, but your brake lights are busted.
(US) A ticket or fare.
- 1898, Willa Cather, The Westbound Train
  Sybil: [..] That reminds me, I haven't got my passes yet! Have you the transportation here from Cheyenne to San Francisco for Mrs. S. Johnston?"
  (Agent looks grave, goes back and fumbles at the papers on his desk, returns to the window with a slip of paper in his hand.)
  Agent: "We had transportation here made out for such a person, but it was called for several hours ago."

loop +? back

loopback (countable and uncountable, plural loopbacks)

The routing of a signal, data stream, etc. from its origin back to the origin, primarily as a means of testing the transmission or transportation infrastructure.

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