Here's what rhymes with belligerency.

Consider these alternatives

legitimizes / enterprises disallowance / allowance obligates / states jeopardizes / enterprises stigmatization / education inseparability / stability impermeability / stability discordance / importance verbalization / relation rescission / given demonization / information criminalisation / relation clericalism / given interventricular / ventricular interrelatedness / relatedness transferability / stability subrogation / education antagonism / given interpenetration / operation