Etymology 1 
From Italian rocchetta, from Old Italian rochetto (“rocket”, literally “a bobbin”), diminutive of rocca (“a distaff”), from Lombardic *rocco, *rocko (“a distaff”), from Proto-Germanic *rukkô (“a distaff”), from Proto-Indo-European *rukn-, *rÁkn-, *rÁnk- (“web; weaving”); related to Proto-Indo-European *araKsn- (“spider”). Cognate with Old High German rocco, rocko, roccho, rocho ("a distaff"; > German Rocken (“a distaff”)), Swedish rock (“a distaff”), Icelandic rokkur (“a distaff”), Middle English rocke (“a distaff”). More at rock.
A rocket (vehicle propelled by a rocket engine)
rocket (plural rockets)
- A rocket engine.
- (military) A non-guided missile propelled by a rocket engine.
- A vehicle propelled by a rocket engine.
- A rocket propelled firework, a skyrocket
- (slang) An ace (the playing card).
- (military slang) An angry communication (such as a letter or telegram) to a subordinate.
- 1980, David Schoenbrun, Soldiers of the Night: The Story of the French Resistance, Dutton, ISBN 9780525206637, page 203,
- While [Colonel Robert] Solborg and [Jacques] Lemaigre[-Dubreuil] were dreaming of revolts, [William Joseph “Wild Bill”] Donovan had learned of Solborg’s insubordination and meddling. He sent him a “rocket” ordering him out of North Africa and back to Lisbon at once. Solborg flew to Lisbon and then on to Washington to face out his problem with Donovan.
Derived terms 
See also 
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rocket (third-person singular simple present rockets, present participle rocketing, simple past and past participle rocketed)
- To accelerate swiftly and powerfully
- To fly vertically
- To rise or soar rapidly
- To carry something in a rocket
- To attack something with rockets
Etymology 2 
French roquette, Italian ruchetta, diminutive of ruca, Latin eruca. Cognate to arugula.
- The leaf vegetable Eruca sativa.