Hyponym
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A hyponym (in Greek: υπονύμιον, literally meaning 'few names') is a word whose extension is included within that of another word. For example, scarlet, vermilion, carmine
According to Victoria Fromkin & Robert Rodman in their book "Introduction to Language" hyponyms are a set of related words whose meaning are specific intances of a more general word e.g., red, while, blue, etc., are hyponyms of the word color). Hyponymy is thus the relationship between a general term such as polygon and specific instances of it, such as the word triangle.