Gum and Hazelwood

Gum noun - Any of various substances (soluble in water) that exude from certain plants; they are gelatinous when moist but harden on drying.

Hazelwood and gum are semantically related. In some cases you can replace term "Hazelwood" with "Gum", this nouns are similar.

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

Gum and hazelwood are semantically related. You can use "Gum" instead a noun "Hazelwood".