Essential Oil University has an extensive line of e.o.'s - read their list of products, you will see what things are available as essential oils or absolutes or hydrosols, etc. If you don't see it there, it probably isn't available or practical for most products. I promise you there's no such thing as sweet apple essence, lol. That's just marketing-speak for "chemical additive that smells like apples". After a read thru their product list you'll have the gist of what is a real essential oil and what cannot possibly be had in e.o. form (banana split, blueberry muffin, pink sugar, etc.), if you see something on a lablel that isn't on any e.o. product list, it's likely that it's not a natural plant product.
Also, don't rely on the front of the label of a bath/body product. It might say Lavender or something on the front but you still need to look at the ingredient label to know what it really is.
To add to the confusion, a company doesn't have to say whether the scent they used is a fragrance oil or essential oil. They can simply put "fragrance" on the label and that's all. It could be e.o.s or synthetic or both.
If you start to use e.o.s around the house and for your personal use, that imo, is a good way to train your nose to know the difference. Once you are accustomed to e.o.s, synthetic fragrances all have a characteristic smell - you will know the difference.