house sparrow vs true sparrow

house sparrow and true sparrow both are nouns.

Word	Noun	Adjective	Verb	Adverb
house sparrow	Yes	No	No	No
true sparrow	Yes	No	No	No

As nouns, true sparrow is a hypernym of house sparrow; that is, true sparrow is a word with a broader meaning than house sparrow:

house sparrow: small hardy brown-and-grey bird native to Europe
true sparrow: any of several small dull-colored singing birds feeding on seeds or insects

Other hypernyms of house sparrow include sparrow.

house sparrow (noun)	true sparrow (noun)
small hardy brown-and-grey bird native to Europe	any of several small dull-colored singing birds feeding on seeds or insects