Professional is related to Nurse. Nurse is a different concept from Doctor. you are likely to find Doctor in/at/on Clinic. 
Love can cause/lead to Pain. Pain is related to Uncomfortable. Uncomfortable is a synonym of Sad. Sad is related to Mood. 
Professional <--RelatedTo--> Nurse <--DistinctFrom--> Doctor --AtLocation--> Clinic 
Love --Causes--> Pain <--RelatedTo--> Uncomfortable <--Synonym--> Sad <--RelatedTo--> Mood 