hou (Greek #3757)
at which place, i.e. where
KJV usage: where(-in), whither(-soever).
Pronounce: hoo
Origin: genitive case of 3739 as adverb
hos (Greek #3739)
the relatively (sometimes demonstrative) pronoun, who, which, what, that
KJV usage: one, (an-, the) other, some, that, what, which, who(-m, -se), etc. See also 3757.
Pronounce: hos
Origin: ἥ (hay), and neuter ὅ (ho) probably a primary word (or perhaps a form of the article 3588)