6. anytime -- any time

Come see us anytime (whenever) you are in town.
Did you have dealings with them at any time in the past? (Two words after a preposition such as at).

7. anyway -- any way

Anyway (in any case), we can't spare him now.
If we can help in any way (by any method), please phone.

8. awhile -- a while

You may have to wait awhile. (Adverb is one word).
You may have to wait for a while. (Noun is one word, preceded by an article "a").