variable star

English Thesaurus

1. a star that varies noticeably in brightness (noun.object)

hypernym	:	star,
definition	:	(astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior (noun.object)

instance hyponym	:	north star, polar star, polaris, pole star, polestar,
definition	:	the brightest star in Ursa Minor; at the end of the handle of the Little Dipper; the northern axis of the earth points toward it (noun.object)