Tropical is related to Palm. Palm is part of Hand. Hand is part of Arm. Armed is derived from Arm. 
Lip can be used for Pleasure. Drinking can be used for Pleasure. 
Tropical <--RelatedTo--> Palm --PartOf--> Hand --PartOf--> Arm <--DerivedFrom-- Armed 
Lip --UsedFor--> Pleasure <--UsedFor-- Drinking 