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"La mantequilla" is a form of "mantequilla", a noun which is often translated as "butter". "Por favor" is a phrase which is often translated as "please". Learn more about the difference between "por favor" and "la mantequilla" below.
por favor(
pohr
fah
-
bohr
)A phrase is a group of words commonly used together (e.g., once upon a time).
la mantequilla(
mahn
-
teh
-
kee
-
yah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).