Expresses an idea of 'both A and B' or 'be it A or B'; 'not only A but also B'.
Long explanation:
The grammar point Noun といわず Noun といわず is used when mentioning two things or situations and expressing the meaning of 'both A and B'. This structure can be used to express the idea of not only mentioning A but also implying B. It often used to show that something applies to multiple situations or subjects, without distinction.