Hyar vs Hyah - What's the difference?

As an adverb hyar

is here.

is hear.

a call, often to horses, livestock, or cattle, to move forward or proceed.

(en adverb)

(dialectal) here

* 1875 , -

Who CALL me? Listen down de ribber, Dinah! Don’t you hyar

Somebody holl’in’ “Hoo, Jim, hoo?” My Sarah died las’ y’ar;

IS dat black angel done come back to call ole Jim f’om hyar ?

(head)

(dialectal) hear

* 1875 , -

Who CALL me? Listen down de ribber, Dinah! Don’t you hyar

Somebody holl’in’ “Hoo, Jim, hoo?” My Sarah died las’ y’ar;

IS dat black angel done come back to call ole Jim f’om hyar?

----

Perhaps from a variant of

* ya

(en-interjection)

a call, often to horses, livestock, or cattle, to move forward or proceed

Hyah''', mule! '''Hyah !

Variation of kiai.

* hi-yah

(en-interjection)

(martial arts) a vocalisation used when performing a technique or striking a blow