gerontology vs geriatrics

gerontology and geriatrics both are nouns.

Word	Noun	Adjective	Verb	Adverb
gerontology	Yes	No	No	No
geriatrics	Yes	No	No	No

As nouns, gerontology and geriatrics are synonyms defined as:

gerontology and geriatrics: the branch of medical science that deals with diseases and problems specific to old people

gerontology (noun)	geriatrics (noun)
the branch of medical science that deals with diseases and problems specific to old people	the branch of medical science that deals with diseases and problems specific to old people