Here are 2 categories from the 6-17-2019 Jeopardy! match.

The players got all the clues in “V”OCABULARY, except the last one (*):

($200) Title for the student with the highest academic ranking who delivers a speech at graduation
($400) It’s a household appliance, or a space devoid of matter
($600) Hazy or unspecific
($800) This 8-letter word is a synonym for neighborhood
*($1000) It’s a member of the camel family, seen here

ANSWERS: show

The players got ’em all in AN EXPLOSIVE CATEGORY, except the $800 one (*)

($400) Alfred Nobel added an inert substance to a very unstable nitroglycerin to make this more easily handled explosive
*($800) A paper cylinder holding a weak explosive, or a red, white & blue popsicle brand
($1200) It’s the term used for the process of destroying a building by using explosives to make it collapse inward on itself
($1600) The largest explosion in Earth’s recorded history was from one of these on Indonesia in 1815
($2000) These sudden outbursts of energy on the sun’s surface are the largest explosions in the solar system

ANSWERS: show

Today’s Daily Doubles and more information on Final Jeopardy! on Fikkle Fame’s full Daily Jeopardy! Recap