Question

Suffix:affix::dialect: _____ sociolect, prefix, regional dialect, language

Answer 1

Suffix is just a smaller part of an affix, so we need to find a word that is a part of a larger group in order to complete this analogy correctly.
The correct answer is dialect:language.

Answer 2

suffix is to affix as dialect is to language. Option four is correct.

An affix is a morpheme that is attached to a word stem to form a new word or word form.

A suffix is defined as a morpheme added at the end of a word to form a derivative.

A dialect is a particular form of a language which is peculiar to a specific region or social group.

And a language is a system of communication used by a particular country or community. Language is the method of human communication, either spoken or written, consisting of the use of words in a structured and conventional way.