Quick answer
"Who" is a pronoun which is often translated as "quién", and "either" is a conjunction which is often translated as "o". Learn more about the difference between "who" and "either" below.
A pronoun is a word that stands in for a noun (e.g. she).
1. (interrogative)
a. quién
Hello? Who is calling?¿Hola? ¿Quién llama?
I don't know who he is, but he looks a lot like my brother.No sé quién es, pero se parece mucho a mi hermano.
2. (relative)
a. quien
My father, who is 60 years old, won a tennis tournament.Mi padre, quien tiene 60 años, ganó un torneo de tenis.
b. que
My friend is the one who has a date tonight.Mi amigo es el que tiene una cita esta noche.
An abbreviation is the shortened form of a word or group of words (e.g. "UFO" = "unidentified flying object"; "p." = "page").
3. (World Health Organization)
a. OMS
Breast milk has many benefits. According to the WHO, exclusive breastfeeding is the best option during the first six months of life.La leche materna tiene muchos beneficios. Según la OMS, el amamantamiento exclusivo es la mejor opción durante los primeros seis meses de vida.
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A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
1. (indicating two options)
a. o
Either close the door or come inside.O cierra la puerta o entra.
b. u (before a word beginning with "o/ho")
It'll take either hours or mere minutes.Se tardará u horas o unos minutos.
An adjective is a word that describes a noun (e.g. the big dog).
2. (one or another)
a. cualquiera
You can choose either glass.Puedes escoger cualquiera de los dos vasos.
b. ninguno (with a negated verb)
I don't think either team will win.No creo que gane ninguno de los dos equipos.
3. (both)
a. ambos
There was a person on either side of me on the plane.Tenía a una persona a ambos lados de mí en el avión.
b. cada
There were beautiful ferns on either side of the country lane.Había unos helechos hermosos a cada lado del sendero rural.
A pronoun is a word that stands in for a noun (e.g. she).
4. (one or another)
a. cualquiera
I like both of those popsicle flavors, so I can eat either.Me gustan las paletas de ambos sabores, así que puedo comerme cualquiera.
b. ninguno (with a negated verb)
I don't like beef or chicken sandwiches. I don't want either.No me gustan los sándwiches ni de carne ni de pollo. No quiero ninguno.
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
5. (as well)
a. tampoco (with a negated verb)
I don't like cockroaches either.No me gustan las cucarachas tampoco.
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