This is the 2411th most frequent Japanese word.
ブドウ
Grape.
In this sentence, ブドウ is used as the subject to express preference for grapes.
ブドウが好きです。
I like grapes.
Here, ブドウ acts as the object of the verb 買いました (bought).
ブドウを買いました。
I bought grapes.
ブドウ is used as a noun modified by the adjective おいしい to describe its quality.