NERD ALERT!

I don't know what the technical term is for these two-word rhyming adjectives (and sometimes nouns) or if there is one at all. Kinda like onomatopoeia, but not. Maybe they're something we need a name for.

willy-nilly
loosey-goosey
hoity-toity
hodge-podge
hoi-polloi
higgledy-piggledy
argy-bargy
harum-scarum