How do you express the meaning of words like race, breed, cultivars or variety?

Race – it is a classification system used to categories human into many groups or populations. Race is an informal taxon and is kept below the species. This means that members from different races of the same species can be interbreed.

Breed – It is a specific group of domestic animals or plants having homogenous appearance, characteristics or behaviours that distinguish it from other animals or plants of the same species. This homogeneity is through selective breeding.

Cultivators – A selected group of plants selected for desirable characteristics which can be raised through vegetative propagation.

Variety – Variety is similar to race but is used for the plants. Thus variety is informal taxon which is kept below the species in the plant kingdom. A variety arises naturally in the plant kingdom and plant grown from its seeds will typically come out true to type.