Increase is the opposite of Plunge. Plunge is a synonym of Dump. Dump is a synonym of Deck. Deck is a synonym of Grace. 
Secretary can Page. Page is related to Assistant. 
Increase <--Antonym--> Plunge <--Synonym--> Dump <--Synonym--> Deck <--Synonym--> Grace 
Secretary --CapableOf--> Page <--RelatedTo--> Assistant 