Synonyms and Antonyms of keystone
- a sense of history is the keystone to the city's draw as a tourist destination
anchorage, bed, brace, bulwark, buttress, framework, infrastructure, mount, prop, shore, stay, substratum, substructure, support
assumption, justification, premise (also premiss), presumption, presupposition, rationale, supposition, theory, thesis, warrant
backbone, center, core, cornerstone, eye, focus, heart, hub, kernel, keystone, nucleus, seat