Strictly speaking, your question is not correct.
The following question is correct.
What is the difference between 모두 and 전부 ? since both of them mean "Everything".
모든 means "all, every, whole, entire"
it is a determiner and used before a noun.
ex)
모든 사람 = everyone
모든 것 = everything
모든 진실 = whole truth
모두 means
1. all, everyone, everybody (NOUN)
2. all, altogether, all together, in all (ADVERB)
전부 means
1. the whole, everything (NOUN)
2. all, altogether, all together, in all (ADVERB)
If 모두 and 전부 are used as an adverb, they can be replaced with each other.
But, if 모두 is used as a noun, it usually comes to the people.
ex)
그의 말은 전부 거짓말이다 = 그의 말은 모두 거짓말이다
Everything he says is a lie
나는 그 작가의 소설을 전부 읽었다 = 나는 그 작가의 소설을 모두 읽었다
I've read every novel that writer's ever written.
모두가 고개를 숙였다
Everyone lowered their heads
가족 모두가 여행을 떠났다
The whole family left on a trip.