Flowering tree and Yellow poplar

Flowering tree noun - Any tree having seeds and ovules contained in the ovary.

Yellow poplar and flowering tree are semantically related. In some cases you can replace phrase "Yellow poplar" with "Flowering tree", this phrases are similar.

Yellow poplar noun - Tall North American deciduous timber tree having large tulip-shaped greenish yellow flowers and conelike fruit; yields soft white woods used especially for cabinet work.

Flowering tree and yellow poplar are semantically related. You can use "Flowering tree" instead a noun phrase "Yellow poplar".