For this case we have to:
Acute words are those in which the voice is accented in the last syllable. These words carry accents when they end in "n, s or vowel".
So, interest carries an accent.
"Interés"
The serious words are those in which the voice is accentuated in the penultimate syllable. Serious words have a tilde when they end in any consonant, less n or s.
So, the exam does not have an accent.
"Examen"
The words esdrujulas are those in which the voice is emphasized in the antebellum syllable. These words always carry accents.
Thus, exams take accent.
"Exámenes"
Answer:
"Interés"
"Exámenes"
Discriminar is not accentuated