Ms is etymologically related to Mrs. Mrs is related to Title. Title is related to Captain. 
Could is related to Cloud. Cloud is related to Water. Water is related to Sky. Sky is related to Room. 
Ms --EtymologicallyRelatedTo--> Mrs <--RelatedTo--> Title <--RelatedTo--> Captain 
Could <--RelatedTo--> Cloud <--RelatedTo--> Water <--RelatedTo--> Sky <--RelatedTo--> Room 