These are all listed by Uwajimaya (a chain of Japanese food stores in America's Pacific North West) as "8 Different Types of Japanese Seaweed". According to Wikipedia, aonori is made from the same seaweed as Welsh laverbread.
According to Uwajimaya, nori and aonori are not the same thing: "While nori usually is found in dried sheets, aonori usually comes in smaller dried flakes or coarsely powdered. Predictably, it's then not used to wrap other foods like nori so often is but is common as a seasoning or garnish. Aonori is commonly used to garnish yakisoba, okonomiyaki and takoyaki and is an essential ingredient for furikake."
Hopefully this clears that one up ...
© Haydn Thompson 2023