Lead is related to Scientific. Scientific is related to Observation. Observation is related to Experiment. 
Derive is a synonym of Come. Come is a synonym of Gather. Gather is a synonym of Harvest. 
Lead <--RelatedTo--> Scientific <--RelatedTo--> Observation <--RelatedTo--> Experiment 
Derive <--Synonym--> Come <--Synonym--> Gather <--Synonym--> Harvest 