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"Presunta" is a form of "presunto", an adjective which is often translated as "supposed". "O" is a conjunction which is often translated as "or". Learn more about the difference between "presunta" and "o" below.
presunto(
preh
-
soon
-
toh
)An adjective is a word that describes a noun (e.g., the big dog).
1. (assumed)
2. (named)
a. so-called
Descubrí que mis presuntos amigos me robaban dinero.I found out that my so-called friends stole money from me.
a. presumptive
El príncipe Felipe es el presunto heredero del trono.Prince Felipe is the presumptive heir to the throne.
o, la o(
oh
)A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
a. either...or
Terminarás tu tarea o por las buenas o por las malas.You're going to finish your homework either the easy way or the hard way.
3. (otherwise)
a. or
La residencia del presidente de los Estados Unidos, o Casa Blanca, fue construida en 1790.The residence of the President of the United States, or the White House, was built in 1790.
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).