Solutions to all the six Doublets are shown on the left. 

The Doublets "ape-man", "tea-pot" and "ship-dock" were created by Lewis Carroll; 
the last two of them were rediscovered by Edward Wakeling.

The Doublet "cold-warm" was proposed by Dmitri Borgmann. 

The Doublet "word-golf" is created from the name given to the Doublets game by Vladimir Nabokov. 

The Doublet "hand-foot" was found in Professor Hoffmann's book "Hoffmann's Puzzles Old & New"; he shows a six-step solution.