Agriculture is related to Crop. Crop is a type of Plant. Plant is a synonym of Works. 
Early is related to Prior. Prior is related to Stretch. Stretch is related to Strong. Strong is a synonym of Hard. 
Agriculture <--RelatedTo--> Crop --IsA--> Plant <--Synonym--> Works 
Early <--RelatedTo--> Prior <--RelatedTo--> Stretch <--RelatedTo--> Strong <--Synonym--> Hard 