Diplomatic rhymes with:
undiplomatic, undiplomatic, undiplomatic, emblematic, problematic, telematic, undiplomatic, aromatic, asymptomatic, automatic, axiomatic, cinematic, diagrammatic, dramatic, emblematic, epigrammatic, idiomatic, mathematic, melodramatic, problematic, programmatic, psychosomatic, semiautomatic, symptomatic, systematic, telematic, undiplomatic
Diplomatic sounds like:
defoliants, deployments, diplomat's, diplomats, diplomats', duplantis