Lingual Trinity

Mr. E. L., Mr. E. E., and Mr. R. K. met together.

Mr. E. L. shows a word, 6 letters, all capital.

• In Mr. E. E.'s vision, the word means "wine."

• In Mr. R. K.'s vision, the word means "soy."

Mr. E. E. shows a word, 5 letters, all capital.

• In Mr. E. L.'s vision, the word means "bay."

• In Mr. R. K.'s vision, the word means "wow."

Mr. R. K. shows a word, 3 letters, all capital.

• In Mr. E. L.'s vision, the word means "to."

• In Mr. E. E.'s vision, the word means "it."

What are the words?

Subtle Hint:

They are visually impaired.

Moderate Hint:

The word Mr. E. L. presented is a mathematical term.
The word Mr. E. E. presented is an adjective.
The word Mr. R. K. presented is a pronoun.

Decisive Hint:

Lookalike letters

Partial answer - don't have first word

The three participants are

the English Language (E. L.) , Greek (E.E.), and Russian (R.K.) .

The words are

???:
BAY: bay = "bay"; вау = "wow".
TO: to = "to"; το = "it".

• I don't like posting partials, especially this close and for puzzles this small. But I've tried every possible translation of "wine" into Greek that I can find, and all of them either have a non-Russian letter in all-caps, or don't mean anything when interpreted as Russian.
– Deusovi
Jul 1, 2020 at 16:28
• remember that the first word also has to look like a capital rot13(ratyvfu jbeq) Jul 1, 2020 at 18:12
• @Forgotten_User Not necessarily. The second one doesn't seem to work the other way.
– Deusovi
Jul 1, 2020 at 18:55
• On the second thought, I think there isn't too much of ambiguity. So please keep going. Jul 1, 2020 at 19:35
• @Craftsman For every word, only its presenter knows the right number of letters. Jul 2, 2020 at 23:33

It's been a while, so I'll just reveal the answer.

Mr. E. L., Mr. E. E., and Mr. R. K. stand for, as @Deusovi noticed correctly:

English Latin, Greek Greek(Ελληνικά Ελληνικό), and Russian Cyrillic(Русский Кириллица), respectively.

The gimmick of the riddle is that each participant cannot

see any letters doesn't look like a letter in his language.

The word that Mr. E. L. showed was:

COSINE. Mr. E. E. saw ΟΙΝΕ, which means "wine", and Mr. R. K. saw СОЕ, which means "soy".

The word that Mr. E. E. showed was:

ΒΑΘΥΣ, which means "deep". Mr. E. L. saw BAY, and Mr. R. K. saw ВАУ, which means "wow". The У looks slightly different from Y, but it's just a typeface issue, so never mind.

The word that Mr. R. K. showed was:

ТОЙ, which means "that" or "those". Mr. E. L. saw TO, and Mr. E. E. saw ΤΟ, which means "it".

I really should've sought for better words, but that's it anyway.