Defend is a synonym of Hold. Hold is related to Grasp. 
Line is part of Poem. Line is related to Factory. Factory is related to Work. Work is the opposite of Employ. 
Defend <--Synonym--> Hold <--RelatedTo--> Grasp 
Poem <--PartOf-- Line <--RelatedTo--> Factory <--RelatedTo--> Work <--Antonym--> Employ 