-ac

(Greek > Latin: suffix; from French -aque, or directly from Latin -acus, from Greek -akos forming adjectives. This suffix was used to form names of arts and sciences in Greek and it is now generally used to form new names of sciences in English; meanings, "related to, of the nature of, pertaining to, referring to")

The suffix -ic has related elements.

hypochondriac (s) (noun), hypochondriacs (pl)
An individual with an abnormal and excessive interest in and fear of disease; especially, people who are otherwise healthy: Jane often complained about feeling ill, told her friends, and often went to the doctors, but they could never find anything causing the pain and diagnosed her as being a hypochondriac person.
A strong depression of the mind based on an imaginary ailment.
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iliac
insomniac (s) (noun), insomniacs (pl)
1. The chronic inability to fall asleep or to remain asleep for an adequate length of time: As an insomniac, Janet had problems sleeping at night because she was constantly haunted by the fact that she couldn't pay back her loan debts.
2. Those who can not sleep even when they are sleepy: Being an insomniac, and so not being able to go to sleep, even when he tried to, Harvey decided to go to the bank and seek financial help to solve his payment problems because they were constantly on his mind.
Can an insomniac be fined for resisting a rest?
—Graffiti
maniac
1. Considered an “obsolete” term for a mentally ill or disturbed person.
2. A reference to someone who is suffering from, or who has, a mental derangement characterized by great excitement, delusions and hallucinations and, in extreme stages, by great violence.
melancholiac
1. Feeling or tending to feel a thoughtful or gentle sadness.
2. Experiencing psychiatric depression.
3, A reference to someone who has psychiatric depression
phobiac (s) (noun), phobiacs (pl)
One who has an abnormal fear of something: Roy was considered to be a phobiac because he never wanted to open doors with his hands, or have people shake his hands.
prosodiac
pulmoniac
pyromaniac (s) (noun), pyromaniacs (pl)
A person who has an uncontrollable impulse, or urge, to start fires: The judge sentenced Sam, who was identified as a pyromaniac, to house arrest with a surveillance bracelet to track and restrict his activities in case he were to have a compulsion to ignite anything.
Someone who has a compulsion to set fires.
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Someone who has an insane desire to set fires.
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sacroiliac (s) (noun), sacroiliacs (pl)
The part of the skeletal system that includes the bones of the pelvic area and their associated ligaments: Wearing a special brace for his sacroiliac provided some comfort for Tommy when he was walking.
symposiac
A convivial meeting for drinking, music, and intellectual discussion among the ancient Greeks; now, a meeting or conference for the discussion of a topic or special subject.
zodiac
Literally a “circle of animal figures”; a narrow band in the sky in which the movements of the major planets, Sun, and Moon take place; astrologically divided into twelve (or thirteen?) sections named for the major constellations. The constellations are Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, Pisces, and Ophiuchus [?].