Risk, the word itself sounds something vulnerable, it is the probability or threat of injury, damage, loss, liability or some negative occurrence which can be avoided with preventive approach. Hazard and risk have a consistent relationship with any work activities carried out on a work (e.g. construction) site.
Fire risk assessment, the term itself says a lot. Identification of all potential sources of ignition which can give rise to fire such as naked flames, hot surfaces (like heaters, electrical equipment, lighting), other potential fire hazards like cutting, welding of equipment etc. is termed as fire risk assessment.