The /r/ of Puerto Rico can be an alveolar flap or trill. This is the same in other varieties of Spanish. However, the /r/ can also be realized with a voiceless velar fricative. The use of the voiceless velar fricative for the /r/ is limited to Puerto Rico.
The voiceless velar fricative is a consonant of Spanish. It occurs in words such as gelatina (gelatin), jardín (garden) and juguete (toy). However, the same sound can be used in Puerto Rican Spanish for the /r/. In Puerto Rican Spanish, the voiceless velar fricative can occur in the following words:
carro (car)
hierro (iron)
perro (dog)
razón (reason)
rey (king)
río (river)
roca (rock)
rueda (wheel)
tierra (land)
torre (tower)
In Puerto Rico, the voiceless velar fricative can be used instead of the voiced alveolar trill. However, in words such as caro (gold), oro (gold) and pero (but), all Spanish dialects use the alveolar flap. The alveolar flap of Spanish only occurs intervocalically.
Puerto Rican Spanish is quite different from other varieties of Spanish. Many Puerto Ricans use the voiceless velar fricative instead of the voiced alveolar trill in words such as those in the list above. The use of the voiceless velar fricative in such words is distinctive of Puerto Rican Spanish.