sampler vs observation station

sampler and observation station both are nouns.

Word	Noun	Adjective	Verb	Adverb
sampler	Yes	No	No	No
observation station	Yes	No	No	No

As nouns, observation station is a hypernym of sampler; that is, observation station is a word with a broader meaning than sampler:

sampler: an observation station that is set up to make sample observations of something
observation station: a station set up for making observations of something

sampler (noun)	observation station (noun)
a piece of embroidery demonstrating skill with various stitches	a station set up for making observations of something
an observation station that is set up to make sample observations of something
an assortment of various samples
someone who samples food or drink for its quality