Duck-bill and Duck-billed platypus

Duck-billed platypus and duck-bill are semantically related. In some cases you can use "Duck-billed platypus" instead a noun phrase "Duck-bill".

Duck-billed platypus noun - Small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae.

Duck-bill and duck-billed platypus are semantically related. Sometimes you can replace phrase "Duck-bill" with "Duck-billed platypus", this phrases are similar.