another vs some other

another and some other both are adjectives.

Word	Noun	Adjective	Verb	Adverb
another	No	Yes	No	No
some other	No	Yes	No	No

As adjectives, another and some other are synonyms defined as:

another and some other: any of various alternatives; some other; entity, singular, other pronoun; quantifier, singular, another

another (adjective)	some other (adjective)
any of various alternatives; some other; entity, singular, other pronoun; quantifier, singular, another	any of various alternatives; some other; entity, singular, other pronoun; quantifier, singular, another