sparrow vs true sparrow

sparrow and true sparrow both are nouns.

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

As nouns, sparrow and true sparrow are synonyms defined as:

sparrow and true sparrow: any of several small dull-colored singing birds feeding on seeds or insects

sparrow (noun)	true sparrow (noun)
any of several small dull-colored singing birds feeding on seeds or insects	any of several small dull-colored singing birds feeding on seeds or insects
small brownish European songbird