bioweapon vs W.M.D.

bioweapon and W.M.D. both are nouns.

Word	Noun	Adjective	Verb	Adverb
bioweapon	Yes	No	No	No
W.M.D.	Yes	No	No	No

As nouns, W.M.D. is a hypernym of bioweapon; that is, W.M.D. is a word with a broader meaning than bioweapon:

bioweapon: any weapon usable in biological warfare
W.M.D.: a weapon that kills or injures civilian as well as military personnel (nuclear and chemical and biological weapons)

Other hypernyms of bioweapon include weapon of mass destruction, WMD.

bioweapon (noun)	W.M.D. (noun)
any weapon usable in biological warfare	a weapon that kills or injures civilian as well as military personnel (nuclear and chemical and biological weapons)