Clairoma is the term given to describe being able to sense smells. Some spirit communicators may send the medium a scent that identifies them, such as tobacco, aftershave and perfumes, bread, flowers etc. Trance is a form of advanced mediumship where a spirit person uses the medium's body to communicate with others, usually in a development circle. There is also light trance, sometimes referred to as overshadowing, although similar, this is caused by spirit guides being very close and and guiding the medium to speak. This should not be attempted without supervision.
Clairvoyance is a term given to describe the act of clear sight.
Psychometry is a psychic skill that involves reading objects histories by holding them. No, a medium contacts those in the spirit world , their job is to prove spirit existence and deliver messages. A psychic gets information directly from or concerning the individual, their aim is to help with that persons life problems . Though in a reading both methods may be used by a medium. Most mediums follow the beliefs of The Spiritualist Movement.