redtail vs redstart

redtail and redstart both are nouns.

Word	Noun	Adjective	Verb	Adverb
redtail	Yes	No	No	No
redstart	Yes	No	No	No

As nouns, redtail and redstart are synonyms defined as:

redtail and redstart: European songbird with a reddish breast and tail; related to Old World robins

redtail (noun)	redstart (noun)
dark brown American hawk species having a reddish-brown tail	European songbird with a reddish breast and tail; related to Old World robins
European songbird with a reddish breast and tail; related to Old World robins	flycatching warbler of eastern North America the male having bright orange on sides and wings and tail