This is the 706th most frequent Hungarian word.
hol
"Hol" means "where" in English.
Used as a question word indicating location (interrogative).
Hol van a könyv?
Where is the book?
Used within a subordinate clause to indicate location (relative clause).
Tudom, hol van a könyv.
I know where the book is.
Used rhetorically to imply an obvious location (rhetoric).