Mount Tacoma vs Mount Rainier

Mount Tacoma and Mount Rainier both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mount Tacoma	Yes	No	No	No
Mount Rainier	Yes	No	No	No

As nouns, Mount Tacoma and Mount Rainier are synonyms defined as:

Mount Tacoma and Mount Rainier: a mountain peak in central Washington; highest peak in the Cascade Range; (14,410 feet high)

Other synonyms of Mount Tacoma include Mt. Rainier, Rainier.

Mount Tacoma (noun)	Mount Rainier (noun)
a mountain peak in central Washington; highest peak in the Cascade Range; (14,410 feet high)	a mountain peak in central Washington; highest peak in the Cascade Range; (14,410 feet high)