Grass is related to Lemon. Lemon is the opposite of Orange. Orange is related to Sign. Sign is related to Communication. 
Trip is related to Camp. Camp is related to Bag. Bag is related to Grocery. 
Grass <--RelatedTo--> Lemon <--Antonym--> Orange <--RelatedTo--> Sign <--RelatedTo--> Communication 
Trip <--RelatedTo--> Camp <--RelatedTo--> Bag <--RelatedTo--> Grocery 