With "psych-"
* -ology: Study of. Examples: psychology, psychopathology.
* -ic: Relating to. Examples: psychic, psychoactive.
* -iatry: Medical practice related to. Example: psychiatry.
* -osis: Abnormal condition. Examples: psychosis, neurosis.
* -ometry: Measurement of. Examples: psychometry, psychometrics.
* -iatric: Related to medical practice. Examples: psychiatric, psychopathic.
With "neur-"
* -ology: Study of. Example: neurology.
* -al: Relating to. Example: neural.
* -itis: Inflammation. Example: neuritis.
* -oma: Tumor. Example: neuroma.
* -on: A nerve cell. Example: neuron.
* -algia: Pain. Example: neuralgia.
These are just a few examples, and there are many more suffixes that can be combined with "psych-" or "neur-" to form different words.