The fragrance of essential oils of oregano and thyme seem to be similar. It has a slightly oily and heavy smell unique to Italian food. If telling the difference, the scent of oregano seems to be somewhat heavier and stronger than the one of thyme. It's Irony that the fresh grass of thyme doesn't smell much because thyme is so regarded as the fragrance smelled even long distance. I have not experienced the natural smell of thyme group at the wild fields. So I want to check it. But the taste in my tongue is somewhat opposite feeling. Chewing a little bit of thyme, the taste and smell of its leaves and stem as a whole strongly spread all over in my mouth felt sweet and cool combined with spicy. However, compared to thyme, taste of fresh oregano leaf is felt as slightly wider and lighter. I guess that it is because of difference shape of leaves. Might as well spirit of plant has worked differently.
Think that cute group of sharp and tiny leaves rounding the stem of thyme at each floors might give it more effective strength in taste compared with the wider and larger but round leaves of oregano. The larger the size, the slower the movement. The scent might follow the same rule from the nature of forms. Refer to herbal books, it is said that one bite of fresh oregano grass for a few minutes, toothache will subside. Because I'm now suffering from toothache, so I tried and it seems to be effective. Both essential oils of thyme and oregano are also frequently used as combination to relieve muscle pains.