First and foremost, the words constitution and structure are considered synonyms.
That being said, I would use them slightly differently in my own speech and writings. I would choose the word constitution when talking about what something is made of, while I would use structure to talk about how it was made. This may be a difference from others, or a regional distinction. The definition of structure supports my own definition; the word structure is used to describe:
mode of building, construction, or organization; arrangement of parts, elements, or constituents
Likewise, the two main definitions of constitution are as follows:
- the way in which a thing is composed or made up; makeup; composition
- the physical character of the body as to strength, health, etc.
Therefore, I would conclude that both constitution and structure can be used to describe how something is made. Structure tends to refer more to the arrangement of the entities the object is composed of, while constitution refers to the identity of the entities themselves.
They are almost the same, usually interchangable, but in certain contexts they might be interpreted slightly differently depending on the listener/reader.
"Right now" could be interpreted as meaning "in this instant", or "at this very moment". Whereas "currently" is still referring to the present, but a present that is still ongoing, possibly for a longer period than "right now".
For example:
"No thank you, I don't want coffee right now" - meaning, I don't want a coffee now at 11.03am, but I might want tea at 11.57am.
"No thank you, I don't currently want coffee" - this could be interpreted as meaning I don't want a coffee at all, because I am having a day/week/etc of not wanting coffee.
Other examples
"Syria is currently at war" is probably more appropriate than "Syria is at war right now" as it better reflects the 'ongoing' nature of war.
"I am on the phone right now" seems less formal than "I am currently on the phone".
The only time I can think that they are not interchangable would be when giving a command:
"We need a doctor, right now!" sounds very urgent.
"We need a doctor, currently!" - implies that we do need a doctor, but it's possible we already have one, the task is ongoing... it just doesn't convey the same sense of urgency.
Best Answer
Clothes are those items you wear.
Clothing is pretty much the same, but it seems it can refer to a special type of clothes (the type it refers to depends on the context).
You can see a useful note on the OALD that I'll paste here for future reference: