These all come from somewhere - first, the naturals have a plant species & variant + a growing region (e.g. Turkey or Italy) + a method of extraction (distillation vs solvent extraction vs Co2 extraction etc). These factors determine the chemical properties (and thus, the smell and usefulness) of natural materials.

Synthetic materials may be manufactured by a number of companies - this is where that little asterisk* came from for the nature-identical; geraniol made by one company may be very slightly different if made by another, due to the production methods used. Not enough of a difference to matter, but for the sake of accuracy let’s acknowledge it.

An accord is another way of saying “a harmonious co-existence of ingredients in a blend that creates a new smell which feels greater than the sum of its parts”. For example patchouli and vanillin will start to smell like chocolate. And now a brand could say “this perfume smells like chocolate. Let’s list chocolate as a note.”

Notes lists are NOT ingredient lists. They are not even necessarily a representation of provenance of the natural items listed. Sometimes the actual ingredients in the perfume overlap what the notes list says. Sometimes they don’t. Notes lists are a brand’s way of describing what they want or hope you will smell.