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They are both written as 何時 (what time) in the dictionary but they seem to be
different words.

My understanding is that "なんじ" asks for "exact hour" while "いつ" is like a
general "when". Is that right?
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2015-01-04T15:59:38.640
21159
2015-01-04T22:58:20.437
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question
word-choice words
What's the difference between いつ and 何時{なんじ}
In short, yes.

何時 (なんじ) asks for the time. It is analogous to 何日, 何月 and 何年.

> 「何時 (なんじ) に行きますか。」  
>  「10時15分にしましょう。」

いつ is general, and includes 何時, 何日, etc. Usually it is written in hiragana.

> 「いつ行きますか。」  
>  「明日にしましょう。」 or 「10時15分にしましょう。」
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2015-01-04T22:58:20.437
21161
2015-01-04T22:58:20.437
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21159
answer