This is the 203rd most frequent Japanese word.
種類
"種類" means "type," "kind," or "category."
In this sentence, 種類 (shurui) is used to denote 'types' or 'kinds' of an object, here referring to cakes.
この店にはさまざまな種類のケーキがあります。
This store has various kinds of cakes.
Here, 種類 (shurui) means 'categories' or 'classes' and pertains to different groups of plants.
植物の種類を調べるのが趣味です。
Researching types of plants is my hobby.
In this context, 種類 (shurui) represents 'breeds' or 'varieties', specifically of dogs.