What's the difference between ocd obsessive?thoughts and schizophrenia? delusional thoughts?

Insight: Occasionally, the line can be blurry. However, basically, an obsession is a thought you know doesn't make sense and a delusion is a fixed false belief that you completely believe regardless of evidence against it.

Exactly that!: In schizophrenia, there is a break from reality, while psychosis is not a major symptom of ocd.

OCD: Also, OCD maintain insight, while schizophrenia lack insight.

Insight: People with obsessions realize that their thoughts are unreasonable and unrealistic and have insight into their thoughts. By definition, a delusion is a false belief but a person thinks it is true. Ocd is considered an anxiety d/o whereas delusions are a problem with one's thoughts.