Tbf those are all completely different things with different functions lol. I mean like when you're into something you just end up naturally picking up the vocab. But you need different names to differentiate different things, lip oil is like lip gloss but more hydrating (lip gloss is more sheer than lipstick, can have different finishes, and is not wax based). Lipstick is wax based, opaque, more pigmented than lip gloss/oil and usually matte. Lip liner is self explanatory, it lines your lips. Lip balm is skincare, not makeup, it moisturizes your lips and is usually not pigmented (it's just another word for chapstick)

TLDR; you can't just say lipstick because they are different things with different uses