Loose is the opposite of Stick. Stick is related to Dog. Dog is related to Loyal. 
Astronomer is a type of Scientist. Scientist can Experiment. Experiment is related to Observation. Observation is a type of Look. 
Loose <--Antonym--> Stick <--RelatedTo--> Dog <--RelatedTo--> Loyal 
Astronomer --IsA--> Scientist --CapableOf--> Experiment <--RelatedTo--> Observation --IsA--> Look 