Yes, piggyback is playable
...and is worth 28 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Piggyback" Definition
noun
The act of transporting piggyback.
The act of carrying something piggyback.
The act of carrying piggyback.
The movement of loaded truck trailers on railroad flatcars.
adverb
By or relating to a method of transportation in which truck trailers are carried on trains, or cars on specially designed trucks.
In connection with something larger or more important: a tariff provision that came piggyback with the tax bill; a piggyback provision to a new piece of legislation.
On the shoulders or back: ride piggyback; a piggyback ride.
On the back or shoulder or astraddle on the hip.
verb-transitive
To cause to be aligned with an issue, for example, that is larger or more important: "a $21.5-million federal grant to piggyback city and state subsidies” ( New York).
verb-intransitive
To function as if carried on the back of another: "This reagent will piggyback onto an enzyme” ( Seth Rolbein).
verb
To attach or append something to another (usually larger) object or event.
Utilizing last mile wiring (not wireless slang) rented from a larger owner isp by a smaller isp, last milers are obligated to sell to competitors in places like canada.
Haul truck trailers loaded with commodities on railroad cars.
Support on the back and shoulders.
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