=1

哇

wā

Wow! sound of a child's crying sound of vomiting

=1

哇

wa

replaces 啊 a when following the vowel "u" or "ao"

=2

哦

é

to chant

=2

哦

ó

oh (interjection indicating doubt or surprise)

=2

哦

ò

oh (interjection indicating that one has just learned sth)

=2

哦

o

sentence-final particle that conveys informality, warmth, friendliness or intimacy may also indicate that one is stating a fact that the other person is not aware of