Cotton is related to Produce. Produce is related to Corn. Corn is related to Grass. Grass is related to Animal. 
Brush is related to Reach. Reach is a synonym of Make. Make is related to Write. Write is related to Mark. 
Cotton <--RelatedTo--> Produce <--RelatedTo--> Corn <--RelatedTo--> Grass <--RelatedTo--> Animal 
Brush <--RelatedTo--> Reach <--Synonym--> Make <--RelatedTo--> Write <--RelatedTo--> Mark 