mountain pine vs Pinus mugo

mountain pine and Pinus mugo both are nouns.

Word	Noun	Adjective	Verb	Adverb
mountain pine	Yes	No	No	No
Pinus mugo	Yes	No	No	No

As nouns, mountain pine and Pinus mugo are synonyms defined as:

mountain pine and Pinus mugo: low shrubby pine of central Europe with short bright green needles in bunches of two

Other synonyms of mountain pine include dwarf mountain pine, mugho pine, mugo pine, Swiss mountain pine.

mountain pine (noun)	Pinus mugo (noun)
low shrubby pine of central Europe with short bright green needles in bunches of two	low shrubby pine of central Europe with short bright green needles in bunches of two
tall pine of western North America with stout blue-green needles; bark is grey-brown with rectangular plates when mature
evergreen tree of New Zealand resembling the kawaka