how do they differ from psychiatrists?
Psychriatists are licensed physicians who can prescribe medications but psychologists does not.
Psychologist
Perhaps the most significant difference is that psychiatrists are licensed physicians, and, as such, psychiatrists are apt to use the medical model to assess mental health problems and to also employ psychotropic medications as a method of addressing mental health problems.

Psychologists generally do not prescribe medication, although in some jurisdictions they do have prescription privileges.
how sexuality after spinal cord injury can be viewed? Often cause sexual dysfunction. how proper counselling can be given on this? Teaching techniques to manage depression and to increase attention to preserved sensations during sexual activity. who are responsible for giving it? Psychologists, social workers, and nurses. what different services does the first one offer? UNANSWERABLE
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Psychologist [SEP] Differences with psychiatrists
Clinical psychologists receive extensive training in psychological test administration, scoring, interpretation, and reporting, while psychiatrists are not trained in psychological testing. In addition, psychologists (particularly those from Ph.D. programs) spend several years in graduate school being trained to conduct behavioral research; their training includes research design and advanced statistical analysis. While this training is available for physicians via dual MD/Ph.D. programs, it is not typically included in standard medical education, although psychiatrists may develop research skills during their residency or a psychiatry fellowship (post-residency). Psychologists from Psy.D. programs tend to have more training and experience in clinical practice (e.g. psychotherapy, testing) than those from Ph.D.