In general, apostles are people God conveyed messages to. Messages conveyed to apostles become scriptures. Christianity has 12 Apostles associated with Jesus. They were the original direct disciples of Jesus.
Hinduism does not have apostles. Gurus are learned people working as teachers. However, unlike the physics and chemistry teachers in schools, Gurus are the ones who teach the subject called “Self Realization” which deals with the question, who am I really?
.
Other reading material: Short answers to real questions about Hinduism
Relevant videos: Swami Nikhilanand Hinduism Q & A: What Is A Guru, Hinduism Q & A: What Is A Saint
Contributor: Dr. Jyoti Lulla
Location of this post (17a): https://www.hinduspeakers.org/ufaqs/difference-between-apostle-and-guru/