Is a "hemorrhagic corpus luteum" and a hemorrhagic corpus luteum cyst the same thing? would either make an ovary look cancerous to a gynonc?

Ovarian Cysts: You didn't give your age, but hemorrhagic corpus lutein cysts are not cancerous, although they can rarely "burst" & bleed into the abdomen and cause considerable discomfort. Any cystic lesion in the ovary should be screened by ultrasound, pelvic exam and possibly other modalities by your gynecologist to rule out cancer, which may be seen over age 45, but often in younger women in their 20's & 30s.

Yes: They are the same thing. In general, they are pretty easy to distinguish from cancer on an ultrasound. You can always get a followup in 4-6 weeks. A hemorrhagic cyst will go away, cancer will not.