candidiasis vs thrush

candidiasis and thrush both are nouns.

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

As nouns, thrush is a hyponym of candidiasis; that is, thrush is a word with a more specific, narrower meaning than candidiasis:

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

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