Native speaker of American English (GenAmE) with a handful of Southernisms but no Piedmontisms (no aboot or hoose):

cot-caught split

y'all is perfectly acceptable 2nd person plural

singular they for unknown sex

pin-pen split

Atlanta - /et 'læ nə/ or usually just /'læ nə/

hundred - halfwy between /hun dred/ and /hu nrt/

firefly

supper when I was a kid, dinner now

pockybook/purse

both mow the lawn/cut the grass

bathoom for bathroom- I don't know if this is a thing but people used to make fun of my dad for it. I say it that way but find it entirely unremarkable.