dexamethasone vs corticosteroid

dexamethasone and corticosteroid both are nouns.

Word	Noun	Adjective	Verb	Adverb
dexamethasone	Yes	No	No	No
corticosteroid	Yes	No	No	No

As nouns, corticosteroid is a hypernym of dexamethasone; that is, corticosteroid is a word with a broader meaning than dexamethasone:

dexamethasone: a corticosteroid drug (trade names Decadron or Dexamethasone Intensol or Dexone or Hexadrol or Oradexon) used to treat allergies or inflammation
corticosteroid: a steroid hormone produced by the adrenal cortex or synthesized; administered as drugs they reduce swelling and decrease the body's immune response

Other hypernyms of dexamethasone include anti-inflammatory, anti-inflammatory drug, adrenal cortical steroid, corticoid.

dexamethasone (noun)	corticosteroid (noun)
a corticosteroid drug (trade names Decadron or Dexamethasone Intensol or Dexone or Hexadrol or Oradexon) used to treat allergies or inflammation	a steroid hormone produced by the adrenal cortex or synthesized; administered as drugs they reduce swelling and decrease the body's immune response