The terms plausible and believable are synonyms. Plausible means something that is probable, acceptable, it is likely true. Believable would mean the same as well, it is something that is realistic, credible or acceptable.

Is plausible the same as believable?

Today the word plausible usually means "reasonable" or "believable," but it once held the meanings "worthy of being applauded" and "approving." It comes to us from the Latin adjective plausibilis ("worthy of applause"), which in turn derives from the verb plaudere, meaning "to applaud or clap." Other plaudere ...

Does plausible mean trustworthy?

having an appearance of truth or reason; seemingly worthy of approval or acceptance; credible; believable: a plausible excuse; a plausible plot. well-spoken and apparently, but often deceptively, worthy of confidence or trust: a plausible commentator.