This is the 502nd most frequent Japanese word.
ポテト
Potato.
Here, 'ポテト' (poteto) is used as a descriptor for 'サラダ' (salad), indicating the type of salad, specifically potato salad.
ポテトサラダが好きです。
I like potato salad.
Here, 'ポテト' (poteto) is used to denote the general category of potatoes, as an individual noun.
ポテトは野菜の一種です。
Potatoes are a type of vegetable.
In this sentence, 'ポテト' (poteto) is part of 'フライドポテト' (fried potato), which refers to French fries, showing its usage within a fixed noun phrase.