Synonyms for Aboard:

adj.

on or in a transportation object (adjective)
en route, in transit, traveling, Consigned, loaded, Embarked.

n.

Booking office, board, bus, book on, ARR, bookable, booking, aisle seat. Amid, at, Against, Into, Among, barring, failing, From. aboard (noun)
alongside, on base, onboard.
onboard (noun)
fob, topside, Embarked, en route, on ship, loaded, in the hold, being transported, on board ship, freight on board, traveling, at point of entry, afloat, Shipped, on deck, in transit, Consigned, at sea, being shipped.

Other synonyms:

barring, Amid, Booking office, Into, ARR, From, book on, Among, Against, afloat, aisle seat. at, board, failing. bus. Other relevant words:
bookable, Among, traveling, bus, en route, board, Against, From, on ship, on board ship, failing, Amid, Into, fob, Embarked, booking, topside, ARR, at, on deck, in transit, Consigned, barring, loaded, Shipped, afloat.

Usage examples for aboard

  1. Besides, he'll be sick of the whole thing by that time and only too glad to step aboard – Wild Justice: Stories of the South Seas by Lloyd Osbourne
  2. It is closed aboard of me now, but it will come lower and lower, and then- it will burst, and I shall be no more. – Annie o' the Banks o' Dee by Gordon Stables
  3. Every bullet aboard came out with us. – The Giants From Outer Space by Geoff St. Reynard