Conventional is a synonym of Normal. Normal is a different concept from Weird. Weird is related to Book. Book is the opposite of Page. 
Park is related to Garden. Garden is related to Nature. Nature is related to Environment. 
Conventional <--Synonym--> Normal <--DistinctFrom--> Weird <--RelatedTo--> Book <--Antonym--> Page 
Park <--RelatedTo--> Garden <--RelatedTo--> Nature <--RelatedTo--> Environment 