This is a rather unusual glossary in that all of the words on the list are essentially synonymous - they are nouns meaning nonsense, gibberish, claptrap, hogwash, rubbish ... you get the idea. It probably shouldn't be surprising that this category is so productive of weird words. After all, what better way to disparage someone's ideas than to combine some nonsense syllables to make a descriptor for them? You more or less always can identify their meaning from context alone - either they're used as interjections, preceded by words like 'such' or 'unadulterated' or 'ridiculous'. But which to choose? You have the reduplicated ones (fiddle-faddle), the pseudo-classical (brimborion), the ones that literally mean something repulsive (spinach), and of course the wide variety that are euphemisms for bodily functions. Excluded from this list are the wide variety of very fun terms that are simple vulgarities without any specific reference to nonsense.
Word
Definition
ackamarackus
pretentious or deceptive nonsense
baboonery
foolishness; stupidity; nonsense
balderdash
nonsense; a jumble of words
ballyhoo
bombastic or pretentious nonsense
baloney
humbug; nonsense
bambosh
deceptive nonsense
bilge
lower point of inner hull of a ship; nonsense or rubbish
blague
humbug; pretentious nonsense
blague
pretentious nonsense
blarney
skilful flattery; nonsense
bletherskate
a garrulous talker of nonsense
brimborion
worthless nonsense; trash
bugaboo
loud or empty nonsense
buncombe
speech-making intended for the mass media; humbug
bunk
nonsense; humbug
bushwa
nonsense
cack
rubbish; worthless nonsense
claptrap
showy language designed to gain praise; nonsense
clatfart
idle chatter; nonsense
codswallop
something utterly senseless; nonsense
effutiation
twaddle; humbug
eyewash
humbug; something done merely for effect
fadoodle
nonsense
falderal
nonsense; meaningless refrain of a song
fandangle
pretentious tomfoolery
fiddlededee
nonsense
fiddle-faddle
trifling talk
flam
humbug; trickery
flannel
ostentatious nonsense
flapdoodle
gross flattery; nonsense
flimflam
nonsense; trickery
flummadiddle
nonsense; humbug
flummery
anything insipid; empty compliment; humbug
fribble
frivolous nonsense; a trifling thing or person
fustian
pretentious writing or speech; inflated or nonsensical language
galbanum
nonsense; a kind of gum resin
galimatias
nonsense; confused mixture of unrelated things
gammon
to feign an action; perpetrate a hoax on; nonsense, rubbish
gibberish
nonsense talk
grimgribber
learned gibberish; legal jargon
haver
foolish nonsense
hibber-gibber
gibberish
hogwash
nonsense; worthless idea
hooey
nonsense; humbug
humbug
nonsense
jabberwock
nonsense, gibberish
jiggery-pokery
deceptive or manipulative humbug
kelter
nonsense
kidology
deceptive trickery; nonsense
linsey-woolsey
coarse inferior wool or wool-flax weave; nonsense or confusion