When someone has a particular wallet which he spends Bitcoins from can he be considered a Bitcoin investor?
Or does the term investor refer only to those who hodl Bitcoin?
You can be both an active user and an investor at the same time. If you own some amount of BTC, constantly spending and earning or rebuying a part of bit, but also holding some for the future, then you are simultaneously an investor and a user.
Outside of the US, a lot of people store their wealth in the US dollar, because it's more stable than their home currency. But they aren't typically called "USD investors". Technically, the same should be true for those who own BTC, because Bitcoin is a currency. But it's so fast growing that a lot of people buy it for the sake of making quick profits, which is easier to categorize as investing.
Yes. We share the same opinion. A bitcoin investor can be an active bitcoin user as well if he constantly buy and hold bitcoin and sell for future profits, or use it as a mode of payment when price increases or whenever it’s applicable to. But if your intention is not actually to make profits but just use it as a sole currency in the future, then you are just one of those who promote the usage of bitcoin as what its originally designed.