General greeting word?
As "ohayou" is a greeting in the morning, "konnichiwa" is in the afternoon and "konbanwa" is in the night, does japanese language have a more general greeting word? As "hello" in english or "hola" in spanish, that could be used in any context?

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Yeah, I generally use "Ohayou!" (or the other greetings you mentioned) with my Japanese friends. Sometimes they use "Genki?" (Happy?). But when I was in high school where there were many bilingual Japanese-Americans, we used the casual masculine-sounding expression "Osu!" (pronounced "os") among friends. It's crude for women to use this, but it was a cool thing for us as teenagers.

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ohayou is mot nescessary morning greeting, it can be used all day.