You are probably familiar with Bytes and Bits. (If not: Wikipedia knows)
Since IOTA is not based on binary but trinary/ternary computing, we need different names.
A bit is a digit in a base 2 number system: either 0 or 1
A byte consists of 8 bits
A trit is a digit in a base 3 number system: either 0, 1 or 2
This is what it says on the IOTA Development Roadmap:
One of the main ways to extend the utility and applications of IOTA is through oracles. Through this one can feed outside data, such as timestamps, into the IOTA network. You can expect some exciting announcements here.
Stage: Advanced development
A problem with smart contracts is ...
Yes, they are interchangeable. The term I've heard foundation members use more often is token.
Most people however just say "iotas", "kiloiotas" (1000), "megaiotas" (1000000) and so on when they talk about a certain amount of tokens you have/you want to send/etc.
Since IOTA is not just the token but the whole foundation, network, ... you would use "token" ...
In general. Iota is neither a coin, nor a token.
Iota is more then just a Cryptocurrency for payment, like Bitcoin or Ethereum is, so it is not a simple coin. It is not a Token, because a token always depends on a coin, like erc20 tokens. Tokens do have a special usecase and iota does also have one. So if you want to be accurate, there is a new word needed....
Nonce (number generated once) is a 81-tryte hash that is output of the Proof of Work hashing once the target value has been reached. Every transaction must have a nonce for it to be accepted by the network.
A typical transfer in IOTA is a bundle consisting of n transactions, these are recognized by using Index (0,1,2,...
Coin is the original notation for all cryptocurrency -- for example, bitcoin.
Tokens is used as a synonym for coins 99% of the time. The only slight distinction is that some people seem to refer to second layer cryptocurrencies, such as those that rely on Ethereum's smart contract layer or potentially in the future PEAQ tokens on IOTA, as tokens more ...