Gumwood and Sweet gum

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

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

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

Gumwood and sweet gum are semantically related. You can use "Gumwood" instead a noun phrase "Sweet gum".