thrush vs candidiasis

thrush and candidiasis both are nouns.

Word	Noun	Adjective	Verb	Adverb
thrush	Yes	No	No	No
candidiasis	Yes	No	No	No

As nouns, candidiasis is a hypernym of thrush; that is, candidiasis is a word with a broader meaning than thrush:

thrush: candidiasis of the oral cavity; seen mostly in infants or debilitated adults
candidiasis: an infection caused by fungi of the genus Monilia or Candida (especially Candida albicans)

Other hypernyms of thrush include monilia disease, moniliasis.

thrush (noun)	candidiasis (noun)
songbirds characteristically having brownish upper plumage with a spotted breast	an infection caused by fungi of the genus Monilia or Candida (especially Candida albicans)
a woman who sings popular songs
candidiasis of the oral cavity; seen mostly in infants or debilitated adults