sassaby vs antelope

sassaby and antelope both are nouns.

Word	Noun	Adjective	Verb	Adverb
sassaby	Yes	No	No	No
antelope	Yes	No	No	No

As nouns, antelope is a hypernym of sassaby; that is, antelope is a word with a broader meaning than sassaby:

sassaby: a large South African antelope; considered the swiftest hoofed mammal
antelope: graceful Old World ruminant with long legs and horns directed upward and backward; includes gazelles, springboks, impalas, addax, gerenuks, blackbucks, dik-diks

sassaby (noun)	antelope (noun)
a large South African antelope; considered the swiftest hoofed mammal	graceful Old World ruminant with long legs and horns directed upward and backward; includes gazelles, springboks, impalas, addax, gerenuks, blackbucks, dik-diks