problem

(noun) a state of difficulty that needs to be resolved. Synonyms: job. Examples: "She and her husband are having problems." "It is always a job to contact him." "Urban problems such as traffic congestion and smog."

(noun) a question raised for consideration or solution. Examples: "Our homework consisted of ten problems to solve."

(noun) a source of difficulty. Synonyms: trouble. Examples: "One trouble after another delayed the job." "What's the problem?."