vs
QUICK ANSWER
"Canción" is a noun which is often translated as "song", and "CD" is an abbreviation which is often translated as "CD". Learn more about the difference between "canción" and "CD" below.
la canción(
kahn
-
syohn
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
CD(
seh
-
deh
)An abbreviation is the shortened form of a word or group of words (e.g., "UFO" = "unidentified flying object"; "p." = "page").
a. CD
El CD Abbey Road de los Beatles es el último que me falta para completar la discografía.The Beatles' Abbey Road CD is the last one I need to complete the whole collection.