Monthly is related to Mortgage. Mortgage is related to House. House is related to Plant. Plant is part of Ecosystem. 
Specialize is a type of Work. Specialize is a synonym of Specify. Specify is a synonym of Limit. Limitation is derived from Limit. 
Monthly <--RelatedTo--> Mortgage <--RelatedTo--> House <--RelatedTo--> Plant --PartOf--> Ecosystem 
Work <--IsA-- Specialize <--Synonym--> Specify <--Synonym--> Limit <--DerivedFrom-- Limitation 