Meter is a synonym of Time. Time is related to Clock. Clock is related to Mechanism. Mechanism can be used for Work. 
Approach is related to Plan. Plan is related to Bill. Bill is related to Single. 
Meter <--Synonym--> Time <--RelatedTo--> Clock <--RelatedTo--> Mechanism --UsedFor--> Work 
Approach <--RelatedTo--> Plan <--RelatedTo--> Bill <--RelatedTo--> Single 