I am taking morphology class this semester but I am confused with something. What is the root of the word hospitable? When I searched in internet I conclude that the root is the word host or at least hospitable. But then my lecturer said that it was come from the word hospice. I just could not understand what kind of word process and word formation involve if its true it is come from the word hospice. I really appreciate your help.
From the morphological point of view, the noun 'hospitability' is the derivative of 'hospitable' formed by affixation. The noun 'hospitable' is a root word because it was borrowed as a 'ready-made' adjective from French. See Etymology Online Dictionary: hospitable (adj.)
"kind and cordial to strangers or guests," 1560s, from Middle French hospitable, which is formed as if from a Medieval Latin hospitabilis, from the stem of Latin hospitari"be a guest," from hospes (genitive hospitis) "guest" (see host (n.1)). The Latin adjective was hospitalis, but this became a noun in Old French and entered English as hospital. Related: Hospitably.
The earliest recorded root is the Latin word hospit- (nominative hospes) which means "guest". Hospice, hospital and hostel are all derived from it by different routes.
It in turn goes back to the Indo-European *gʰóstis "stranger, guest, enemy", which also underlies both hostile and guest. See Wiktionary