WordNet records no synonym and no antonym for playbook. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a notebook containing descriptions and diagrams of the plays that a team has practiced (especially an American football team)
a book containing the scripts of one or more dramatic plays
“the 1963 playbook leaves out the whole first scene”
Synonyms, antonyms and the broader and narrower relations for playbook come from Princeton University’s WordNet. Full sources and licences.
a scheme or set of strategies for conducting a business campaign or a political campaign
“they borrowed a page from the playbook of the opposition”