Mycosymbiont is a term used to refer to a fungus living in mutualistic relationship with another organism. Synonyms for mycosymbiont include mycorrhizal fungus, symbiotic fungus, mutualistic fungus, endophytic fungus, and fungal partner. Mycorrhizal fungus, as a synonym for mycosymbiont, refers to a fungus that forms a mutualistic relationship with plant roots, enhancing nutrient uptake. Symbiotic fungus is used to describe a fungus that depends on another organism for survival. Mutualistic fungus is used interchangeably with mycosymbiont to describe a fungus that forms a mutually beneficial relationship with another organism. Endophytic fungus refers to a fungus that lives inside plant tissues without causing harm, while fungal partner is a general term used to refer to a fungus involved in a symbiotic relationship.