Instrument is related to Nose. Dog have Nose. Dog can be used for Company. Habitat is a type of Company. 
Portion is etymologically related to Part. Part is related to Sleeve. 
Instrument <--RelatedTo--> Nose <--HasA-- Dog --UsedFor--> Company <--IsA-- Habitat 
Portion --EtymologicallyRelatedTo--> Part <--RelatedTo--> Sleeve 