Recognise synonyms

So, how do you recognise a genuine pair when you see them?

Sigismund never saw Sweden again, but he persistently refused to abandon his claims or recognise the new Swedish government; and this unfortunate obstinacy was to involve Poland in a whole series of unprofitable wars with Sweden.

Those who signed it pledged themselves to recognise the Compacts, and to support as archbishop of Prague, John of Rokycan, who had been chosen by the estates in accordance with an agreement made simultaneously with the Compacts, but whom the Church of Rome refused to recognize.

On the 20th of September 1881 Beheran formally accepted Italian protection, and in the following February an Anglo-Italian convention established the Italian title to Assab on condition that Italy should formally recognise the suzerainty of the Porte and of the khedive over the Red Sea coast, and should prevent the transport of arms and munitions of war through the territory of Assab.

With his mercenaries behind him he met with some small successes in his fight for Normandy, but on the 27th of July he and his ally, the emperor Otto IV., met with a crushing defeat at Bouvines at the hands of Philip Augustus, and even the king himself was compelled to recognise that his hopes of recovering Normandy were at an end.