Hothouse and Pavilion

Hothouse noun - A glass-enclosed building for growing plants.

Pavilion and hothouse are semantically related. in summer house topic. In some cases you can use "Pavilion" instead a noun "Hothouse".

Pavilion noun - A freestanding airy structure in a scenic setting (as a park) typically offering commanding views.

Hothouse and pavilion are semantically related. Sometimes you can replace term "Hothouse" with "Pavilion", this nouns are similar.