Whereabout vs Thereabout - What's the difference?

As adverbs the difference between whereabout and thereabout

is that whereabout is about which; concerning which while thereabout is near that place, time or date.

(-)

(archaic) About which; concerning which.

* Hooker

the object whereabout they are conversant

About where.

(-)

near that place, time or date

Dinner will be ready at 6:30 or thereabout .

approximately that number

The speed of light is 185,000 miles per hour, right? - Yes, thereabout .

(obsolete) concerning that; about that

What will ye dine? I will go thereabout . — Chaucer.

They were much perplexed thereabout . — Luke xxiv. 4.

* thereabouts

* thereabouts