is a specific kind of: quality.

is a broader term that covers: authenticity, genuineness, legitimacy | cogency, rigor, rigour, validity | plausibility, plausibleness | cred, street cred, street credibility.

is an attribute of: believable, credible | incredible, unbelievable.

is the opposite of: incredibility, incredibleness.

derivation: credible | credible.