Yeahinterjection
Expressing joy, celebration, glee, etc.
Yeahadverb
not only so, but;
Yeahinterjection
non-standard spelling of yes, representing a pronunciation
Yeahnoun
non-standard spelling of yes, representing a pronunciation
Yahadverb
Yes.
Yahinterjection
An expression uttered to encourage a horse to run faster.
Yahnoun
An upper-class person, especially a Sloane Ranger.