The scientific classification of Grapefruit and Hazelnut includes the entire classification chart that includes kingdom, family, clade, tribe etc. A kingdom is the second highest taxonomic rank. A taxonomic rank is the level that a living organisms are placed in hierarchical level of arrangement of life forms. All the living organisms are divided into kingdoms. Plant kingdom is a main classification of living organisms that include all plants. There are six kingdoms which are: Plantae, Animalia, Fungi, Protista, Aschaea/Archaeabacteria and Bacteria Eubacteria. Grapefruit and Hazelnut kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Grapefruit and Hazelnut family is a major factor of Grapefruit and Hazelnut Scientific Classification. Plant family helps you narrow the search of your plants. It also gives you idea about, how the plant looks, how the seed will be like etc. These two plant families can be different or same. Grapefruit belongs to the family Rutaceae and Hazelnut belongs to the family Betulaceae.
While comparing scientific classification, Grapefruit and Hazelnut genus and other classification are also important. Also, when you compare Grapefruit and Hazelnut, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Citrus and other plant's genus is Corylus. Grapefruit tribe is Not Available and Hazelnut tribe is Coryleae. Grapefruit clade is Dicotyledonous and order is Sapindales whereas Hazelnut clade is Angiosperms, Eudicots and Rosids and order is Fagales. Every plant have subfamilies. Grapefruit subfamilies are, Rosoideae and Hazelnut subfamilies are Coryloideae. In this way you can compare scientific classification of Grapefruit and Hazelnut and other products also.