Arabic words are either masculine or feminine. For example: رجل (ra-jul) which means man is masculine.امرأة (im-ra-ah) which means woman is feminine. These two examples are very logical. But just like many other languages, everyday objects have their own gender as well. For example the word for ear, must be either masculine or feminine.
The most common way to tell a masculine word from a feminine word is the ة (taa' mar-boo-Tah). If a word ends in a ة (h/t) then it is most likely feminine. To make a masculine word feminine usually a ة(h/t) is added to the end of the word.
For example:
كلب kalb dog
كلبة kalba/kalbah=female dog