Another disorder on the Obsessive-Compulsive spectrum is called Obsessive-Compulsive Personality Disorder. Rather than the habitual compulsions of OCD, OCPD involves a general over-concern with perfectionism, control, rules, and orderliness. Sometimes, it can be difficult to tell the difference between the two, as people with one often have at least a few symptoms of the other. However, diagnosis depends on an overall summary of the symptoms. I can be perfectionistic sometimes; but I don’t really have enough obsession with it to meet the criteria for OCPD. The well-known Jack Nicholson movie As Good As It Gets seems to portray a character with both OCD and OCPD — and it certainly is possible to have both, though I don’t know how common it is.
It seems to me that the link between OCPD and tics is less strong than OCD and tics, but I would be interested in hearing about cases to the contrary.
OCPD is also interesting because it’s more likely to go undiagnosed. Someone who’s just generally overly perfectionistic and enjoys being that way is less likely to even see that they have a problem, and therefore, less likely to seek help. Most people with significant OCD likely get help for it, eventually, but people with OCPD may not, so there could be more people with OCPD than we’re generally aware of.