This video explores the three subtypes of the Enneagram Type Four using three main characters from Pig, Judy, and Cruella.
From "The Complete Enneagram" by Beatrice Chestnut...
"The passion of Type Four is Envy. All Fours have an exaggeration focus on suffering (related to envy), but it’s different for each Subtype. Fours' suffering grows out of the habit of comparing themselves to others and feeling deficient - enviously thinking with something outside of them is better or more ideal and experiencing a sense of inner lack. The Self-preservation Four internalizes and to some extent denies or suppresses suffering; the Social Four lives in it too much and wears it on his or her sleeve; and the Sexual Four projects it out onto others to evacuate (and thus defend against) a painful sense of inferiority."
Terminology differs between Enneagram teachers. Historically and today, most people refer to the Instinctual Variants/Biases as Social, Sexual, and Self-Preservation. Some substitute "One to One" for Sexual, although I personally think this mis-represents the nature of the Sexual "instinct", and is based more in an aversion/misunderstanding what "Sexual" actually means.
Teachers Mario Sikora and Maria Jose Munita of Awareness to Action use the alternate names of Navigating, Transmitting, and Preserving, which I think do a better job of capturing what each Instinct is actually going for.