race vs bustle about

race is a noun but bustle about is not a noun.

Word	Noun	Adjective	Verb	Adverb
race	Yes	No	Yes	No
bustle about	No	No	Yes	No

race (noun)	bustle about (noun)
a canal for a current of water
a contest of speed
any competition
people who are believed to belong to the same genetic stock
(biology) a taxonomic group that is a division of a species; usually arises as a consequence of geographical isolation within a species
the flow of air that is driven backwards by an aircraft propeller

race (verb)	bustle about (verb)
compete in a race	move or cause to move energetically or busily
move hurridly
cause to move fast or to rush or race
to work as fast as possible towards a goal, sometimes in competition with others