The terms "plausible" and "believable" are closely related and both describe something that appears to be credible and acceptable as true or real.

• "Plausible" refers to something that seems logically possible or valid based on reasoning or evidence. It conveys an objective sense of something being reasonable or likely.
• "Believable" means that something can be accepted as true or real, often based on personal judgment or perception. It tends to be a bit more subjective but also emphasizes credibility and the ability to convince or seem trustworthy.

In summary, both terms suggest a level of credibility or trustworthiness, where "plausible" stresses logical reasoning and likelihood, while "believable" highlights acceptance and trust.