In a scientific name,what taxonomic category does the second Latin word indicate?

Assertion $(A)$: $A$ taxonomic category composed of a group of related genera is called a family.
Reason $(R)$: The family $Blattidae$ includes various species of pigeons and doves.

Which of the following is less general in characters as compared to genus?

As we go from species to kingdom in a taxonomic hierarchy,the number of common characteristics

What is the science of classifying all living organisms into different taxa based on their characteristics called?

Who proposed the binomial nomenclature system?