Gumwood and Red gum

Gumwood noun - Wood or lumber from any of various gum trees especially the sweet gum.

Red gum and gumwood are semantically related. In some cases you can replace phrase "Red gum" with "Gumwood", this terms are similar.

Red gum noun - Reddish-brown wood and lumber from heartwood of the sweet gum tree used to make furniture.

Gumwood and red gum are semantically related. Sometimes you can use "Gumwood" instead a noun phrase "Red gum".