Top is a different concept from Low. Low is the opposite of High. High is related to Cloud. Cloud is related to Origin. 
Annual is a type of Plant. Plant is related to Starter. Starter is related to Motor. 
Top <--DistinctFrom--> Low <--Antonym--> High <--RelatedTo--> Cloud <--RelatedTo--> Origin 
Annual --IsA--> Plant <--RelatedTo--> Starter <--RelatedTo--> Motor 