Words can be combined to form compound nouns. These are very common, and new combinations are invented almost daily. They normally have two parts. The first part tells us what kind of object or person it is, or what its purpose is.
Most singular nouns are made plural by simply putting an -s at the end. There are many different rules regarding pluralization, singular and plural nouns, depending on what letter a noun ends in. Irregular nouns do not follow plural noun rules, so they must be memorized or looked up in the dictionary.
Most English nouns do not have grammatical gender. Nouns referring to people do not have separate forms for men (male form) and women (female form). However, some nouns traditionally had different forms. Nowadays, people usually prefer more neutral forms.