When dealing with the subject in question, we must pay attention to some peculiarities, since these make all the difference at the time of written language.
We have our knowledge regarding to grammar rules, with all the rules and possible exceptions, it is part of the construction of our linguistic profile.
That's why we'll know a little more about gender formation in the grammatical class called "substantive".
When we talk about gender, we are referring to the male and female. Let's look at your rating:
biform nouns – They are those that have two distinct forms, both for the female and for the male.
Examples:
boy girl
cat Cat
dog - bitch
common-of-two nouns – They are those that have only one form for male and female, but allow for gender variation through modifying words, including articles, adjectives and pronouns.
Examples:
the student
the student
my fan
my fan
Epicene nouns – They are those that have only one genus and indicate names of certain animals, requiring the use of the words “male and female” to designate them.
Examples:
male alligator
female alligator
male snake
female snake
super common nouns – They are those that do not have any distinction to designate the two genders, that is, a single term is used to represent them.
Examples:
the child
the witness
the individual.
By Vânia Duarte
Graduated in Letters
Brazil School Team
Grammar - Brazil School
Source: Brazil School - https://brasilescola.uol.com.br/gramatica/o-genero-dos-substantivos.htm