Redthroat :: Redthroat (n.) A small Australian singing bird (Phyrrholaemus brunneus). The upper parts are brown, the center of the throat red..
Redtop :: Redtop (n.) A kind of grass (Agrostis vulgaris) highly valued in the United States for pasturage and hay for cattle; -- called also English grass, and in some localities herd's grass. See Illustration in Appendix. The tall redtop is Triodia seslerioides..