On Tue, 25 Jun 2019 at 14:50, mayqel qunen'oS <mihkoun@gmail.com> wrote:

Both {rIp} and {yej} mean "assembly, council".

Is there any kind of difference between them, or are they perfect synonyms ?

Types of {rIp}:

{quprIp}

Types of {yej}:

{yejquv}, {yejHaD}, {yej'an}

You tell me if they're perfect synonyms.

An organization dedicated to scholastic pursuits or research is a yejHaD institute or institution or a yej'an society. The distinction between yejHaD and yej'an is not clear, though the former is usually — but not always — used for larger organizations. It is not known whether the first syllable of these words (yej) is yej council, assembly, but there could be some historic connection. [HolQeD]

With this warning from Okrand regarding analyzing yej in these words, I would avoid drawing a conclusion about the difference between rIp and yej based on those words.

-- 
SuStel
http://trimboli.name