Omega.
***
Omega (Ωω) and Omicron (Oo). Both sound like o nowdays.
you can use the word an if the word after it begins with a vowel
No, a combining vowel is used when the suffix begins with a vowel.
The word "banned" begins with a vowel sound and rhymes with stand.
An evergreen tree. If the word begins in a vowel or consonant with a vowel sound, it is preceded by "an". If the word begins with a regular consonant, it begins with "a".
The question doesn't make sense. A "vowel" is only one letter. So the question is asking "What one Greek letter begins with e?" I think the word you're looking for is epsilon, the fifth letter of the Greek alphabet.
omicron
greek
if the word after it begins in a vowel
Yes. The A is a long A sound, as in sale and pale. The E is silent.
No, "Oedipus" is not a diphthong; it is a proper noun referring to the character from Greek mythology and literature. A diphthong is a complex vowel sound that begins with one vowel and glides into another within the same syllable, such as the "oy" in "boy." The name "Oedipus" contains multiple vowel sounds but does not represent a single vowel sound transition characteristic of a diphthong.
The word you're looking for is "conundrum." It begins with "co" and ends with "om." If you're thinking of a different context or meaning, please provide more details!
The article "an" is used before a word when the word begins with a vowel. "A" is used when the word begins with a consonant. The exceptions are when the word begins with a consonant but it sounds like a vowel, or when it begins with a vowel but it sounds like a consonant. There are very few exceptions. And I cannot think of one at the moment.