Eucalyptus gum and Gum

Eucalyptus gum noun - Reddish-brown dried gummy exudation from any of several trees of the genus Eucalyptus especially Eucalyptus camaldulensis.

Gum and eucalyptus gum are semantically related. In some cases you can use "Gum" instead a noun phrase "Eucalyptus gum".

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

Eucalyptus gum and gum are semantically related. Sometimes you can replace phrase "Eucalyptus gum" with "Gum", this terms are similar.