does [ler] mean "sea" in Irish ?

does  [ler]  mean  "sea" in Irish ?
No, "ler" does not mean "sea" in Irish.
The Irish word for "sea" is "muir". It's pronounced "moor" (similar to the English word "moor").
"Ler" is not a recognized word in Irish Gaelic. It's possible that you may have heard or seen a mispronunciation or misspelling of another word.
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Here are a few Irish words for "ocean" or "sea":
Muir: This is the most common word for "sea" in Irish.
Caolas: This can refer to a narrow sea or strait.
Farraige: This is another word for "sea,"
                       often used in poetry or more formal contexts.
Nial: This term is used to refer to the Atlantic Ocean.