Sharp is a synonym of High. High is related to Very. Very is related to Good. Good is related to Luck. 
Lamp is related to Type. Type is a synonym of Category. Category is related to Art. Art is the opposite of Ugly. 
Sharp <--Synonym--> High <--RelatedTo--> Very <--RelatedTo--> Good <--RelatedTo--> Luck 
Lamp <--RelatedTo--> Type <--Synonym--> Category <--RelatedTo--> Art <--Antonym--> Ugly 