There are no Spanish words that begin with the letter W. There may be some words borrowed from foreign languages that do, but if so they are few. Many do not consider W to be a letter in the Spanish alphabet.
Equis (pronounced AY-kiss)
it is pronounced like oo as in too.
In Spanish, the name "Sierra" is pronounced as "see-EH-rah." The letter "i" is pronounced as a long "ee" sound, the double "r" is pronounced with a rolling "r," and the final "a" is pronounced as "ah." The stress is on the second syllable, so it is pronounced "see-EH-rah" in Spanish.
There's "n," and "~" that's placed over the "n". The former is pronounced as you'd expect an n to be pronounced. The latter is pronounced ny.
H is not pronounced in Spanish.
The letter V is pronounced almost exactly like the letter B in the Spanish alphabet.
The letter "i" in the Spanish alphabet is pronounced the same as the name of the letter "E" in the English alphabet.
The first letter in the Spanish alphabet is also A. The difference is that in Spanish it is pronounced "Ahhh."
x = equis (pronounced as written it in the question)
Jota is pronounced as "HOH-tah" in Spanish. The letter J in Spanish is typically pronounced as an "H" sound.
The i in Spanish is pronounced like the ee in tree.
The letter 'f' is called 'efe' (pronounced EFFay) in Spanish
A. It is pronounced "Ahh"
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You spell it 'b', but the Spanish name for the letter is 'be', pronounced 'bay'
En [en] [e] as in Italian "reggere" to govern [ene] The sound [e] and the letter it represents IS NEVER pronounced [ei]