vocalizer vs thrush

vocalizer and thrush both are nouns.

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

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

vocalizer (noun)	thrush (noun)
a person who sings	songbirds characteristically having brownish upper plumage with a spotted breast
an organism that can utter vocal sounds	a woman who sings popular songs
	candidiasis of the oral cavity; seen mostly in infants or debilitated adults