There is such a thing as a "hard space" which is a separater between words like a normal space but it stops the words from being separated across lines e.g. words with a hard space between them will be kept together on the line. They are also known as "non-breaking spaces". Handy things at times but how do you "input" them using the keyboard?
Its not quite intuitive but Ctrl-Shift-Spacebar will do it.
You can also do it thru the menu bar by choosing Insert|Symbol|Special Characters.