Himalaya vs Himalaya Mountains

Himalaya and Himalaya Mountains both are nouns.

Word	Noun	Adjective	Verb	Adverb
Himalaya	Yes	No	No	No
Himalaya Mountains	Yes	No	No	No

As nouns, Himalaya and Himalaya Mountains are synonyms defined as:

Himalaya and Himalaya Mountains: a mountain range extending 1500 miles on the border between India and Tibet; this range contains the world's highest mountain

Other synonyms of Himalaya include Himalayas.

Himalaya (noun)	Himalaya Mountains (noun)
a mountain range extending 1500 miles on the border between India and Tibet; this range contains the world's highest mountain	a mountain range extending 1500 miles on the border between India and Tibet; this range contains the world's highest mountain