Not only... but also; as well as.
Verb-casual + のみならず + (も), い-Adjective + のみならず + (も), な-Adjective + のみならず + (も), Noun + のみならず + (も)
The ～のみならず～も grammar point is used to show that something applies not only to one thing, but also to another thing. This can be translated as 'not only... but also', or 'as well as' in English. The formation differs depending on whether it is used with a verb, い-adjective, な-adjective, or noun.