Missing is related to Lost. Lost is related to Island. Island is related to Water. Water is the opposite of Steam. 
Root is related to Money. Money is related to Knee. Knee is related to Propose. Propose is related to Alternative. 
Missing <--RelatedTo--> Lost <--RelatedTo--> Island <--RelatedTo--> Water <--Antonym--> Steam 
Root <--RelatedTo--> Money <--RelatedTo--> Knee <--RelatedTo--> Propose <--RelatedTo--> Alternative 