drop-dead vs jargon

drop-dead is not a noun while jargon is a noun.

Word	Noun	Adjective	Verb	Adverb
drop-dead	No	No	No	Yes
jargon	Yes	No	No	No

drop-dead (noun)	jargon (noun)
	a characteristic language of a particular group (as among thieves)
	specialized technical terminology characteristic of a particular subject
	a colorless (or pale yellow or smoky) variety of zircon

drop-dead (adverb)	jargon (adverb)
stunningly or breathtakingly