Needle is related to Tool. Tool is related to Bit. Bit is related to Test. Test is the opposite of Grade. 
Accessible is a synonym of Weak. Weak is similar to Stupid. Stupid is related to Dog. Dog is related to Horse. 
Needle <--RelatedTo--> Tool <--RelatedTo--> Bit <--RelatedTo--> Test <--Antonym--> Grade 
Accessible <--Synonym--> Weak <--SimilarTo--> Stupid <--RelatedTo--> Dog <--RelatedTo--> Horse 