Criterion and Keystone

Criterion noun - Something set up as an example against which others of the same type are compared.

Keystone and criterion are semantically related. In some cases you can use "Keystone" instead a noun "Criterion".

Keystone noun - An immaterial thing upon which something else rests.

Criterion and keystone are semantically related. Sometimes you can use "Criterion" instead a noun "Keystone".