- problem, job - a state of difficulty that needs to be resolved; "she and her husband are having problems"; "it is always a job to contact him"; "urban problems such as traffic congestion and smog"
--1 is a kind of difficulty
--1 has particulars: race problem; balance-of-payments problem - trouble, problem - a source of difficulty; "one trouble after another delayed the job"; "what's the problem?"
--2 is a kind of difficulty
--2 has particulars: can of worms; deep water; growing pains; hydra; matter - problem - a question raised for consideration or solution; "our homework consisted of ten problems to solve"
--3 is a kind of question, head
--3 has particulars: