The general order of asset classes by risk, as most would agree on is government bonds - corporate bonds - stocks - commodities.
Within stocks, large caps (such as your Coke example) tend to be less volatile and therefore considered less risky, as they have more established, time-proven business models and cash flows than smaller companies or younger growth companies such as your Tesla example. Yes, even a long established business model can become obsolete, but if you were to bet on which company has higher risk of going out of business in the next 5 years, most would consider Coke much less risky than Tesla. Industry also plays a role - a utility or telecoms company will most likely have a much more stable business (more immune to economic downturns) than an industrial or consumer discretionary company.
That said, diversification is a huge factor. If you invest in a single stock (like Coke) or just a small number of stocks, you will expose yourself to company-specific risk (a company may, for some reason, fail even when the broad economy is doing well). With broad market indices like S&P500 you diversify this company-specific risk away and you are left with the systematic risk of the broad economy. Therefore, I would put Coke more risky than S&P500 in your list. Comparing Coke with a single stock from the index, Coke may be safer than most. Tesla goes below them as more risky, as you have it.
Question is where to put real estate and it really depends on how you invest in it. If you buy a single property it will be much riskier than a diversified portfolio of properties or a REIT. Moreover, leverage is often used in real estate, and it affects the risk of your investments - if you buy property with 100% cash, it is a much safer investment than if you buy it with 80% debt. Furthermore, like stocks, real estate is not a homogeneous group - you have residential vs. commercial, various types, and location location location. The least risky, cash financed, diversified real estate investments can be placed above (safer than) stocks in your list, but the riskier, leveraged, non-diversified ones go below.
Diversification also plays a role with P2P lending (or credit instruments in general). If you lend to one or just a few people, it is very risky - below S&P500 in your list as you have it. If you lend to 1,000 people, some will default, but overall these losses should be covered by the interest gained from those that won't default, and the investment can be safer than stocks.
Gold has a reputation of being "safe haven", because it often goes up when stocks go down, but there have been many occasions in history when gold lost a lot in a relatively short time. In other words, it is not as safe as many people believe. Using volatility as a risk measure, gold is actually not far from S&P500 long-term. It is certainly safer to invest in gold than most other commodities though.
Cryptocurrencies are new thing and most people don't fully understand them and all their technicalities (myself included). In any case, something that can be worth $3,000 today, $5,000 tomorrow, and $3,000 the next day is not what I would call an investment. It may be a good vehicle for speculators (those who understand it well), but not for investors. Furthermore, there is substantial political/regulatory risk that many fans ignore - what if the government(s) ban them, regulate them, or take other actions that would hurt those markets? As an investor, you have no protection against these things. Perhaps when/if cryptocurrencies become more established, banks and governments are involved, their risk as investments may approach gold or even standard currencies, and they can climb in the list.
Angel investing is in fact a form of equity investing (like stocks), just another level beyond the Tesla kind. Highly speculative and diversification is key, with similar implications as in P2P lending. A diversified portfolio of venture investments would be safer than a single stock like Tesla.
In sum, if I were to sort the exact items from your list, it would be:
1) Government backed bonds
2=) P2P lending
2=) Real estate
2=) S&P 500 (Google, Amazon, Apple)
3) Gold (/Solver/Platinum ??)
4) Coke / (other 100year + companies)
(If S&P 500 was meant as single stock like Google, Amazon, Apple, it would go here)
5) Tesla / SpaceX
6) Angel Investing / A/B startup investing.
(If diversified, angel investing goes to place 3 right behind S&P500, before all the single stock investments)
The exact order of the 2= items would depend on the details, as discussed above.
To some extent the order is subject to personal opinion and what exactly one understands behind the individual items.