Adelie penguin and Penguin

Adelie penguin noun - Medium-sized penguins occurring in large colonies on the Adelie Coast of Antarctica.

Penguin and Adelie penguin are semantically related. In some cases you can use "Penguin" instead a noun phrase "Adelie penguin".

Penguin noun - Short-legged flightless birds of cold southern especially Antarctic regions having webbed feet and wings modified as flippers.

Adelie penguin and penguin are semantically related. Sometimes you can replace phrase "Adelie penguin" with "Penguin", this terms are similar.