Look is related to Sense. Sense is related to Touch. Touch is related to Movement. Movement is related to Race. 
Sheep is related to Ship. Equip is etymologically related to Ship. Invest is a type of Equip. 
Look <--RelatedTo--> Sense <--RelatedTo--> Touch <--RelatedTo--> Movement <--RelatedTo--> Race 
Sheep <--RelatedTo--> Ship <--EtymologicallyRelatedTo-- Equip <--IsA-- Invest 