stablemate

From stable + -mate.

stablemate (plural stablemates)

1. One (such as a racehorse) from the same stable.
2. One from the same organization or background.
   • 2016 November 21, Oliver Duff, Letter from the Editor, in the i, № 1,869, page 3/5:

     That is why we are stepping in to fill the gap, partnering with the homeless charity Centrepoint, its patron the Duke of Cambridge (rather helpful in getting things done), various tech partners and our former stablemates, The Independent and the London Evening Standard.

• metastable, metatables, steam table, steamtable, tablemates