1) Semantic relation 2) Subordination 
[n] - the semantic relation of being subordinate or belonging to a lower rank or class
hyponym, hyponymy 1. A name made invalid by the lack of adequate contemporary description of the taxon it was intended to designate. 2. A term that denotes a subcategory of a more general class; such as, 'chair' and 'table' are hyponyms of furniture. A word that has a more specific meaning than another term; for example, in the relationship betwe...
the state or quality of being a hyponym.