back or aback

[sarathnirmala]

could you pls tell the difference between the back and aback with some suitable sentences.

Also ashame/shame
Asleep/sleep

[xpert]

The part of speech is important here.

aback (adv) click here

back (adv/n/adj/v) ... For back as an adverb, click here

You can search Longman for the rest.

Notice that ashamed is (adj) shame is (n)
ashame never exists in English dictionaries

Good luck