Both and Some

Both adjective - (used with count nouns) two considered together; the two.

Some and both are semantically related. In some cases you can use "Some" instead an adjective "Both".

Some adjective - Quantifier; used with either mass nouns or plural count nouns to indicate an unspecified number or quantity.

Both and some are semantically related. You can use "Both" instead an adjective "Some".